GB T 17107-1997 Structural Steel Grades and Mechanical Property for Forgings

Anystandards.com

GB/T 17107 – 1997 1997

Foreword This standard is made t o carry out normalized and standardized management to carbon constructional steel forging and alloy constructional steel forging according according to those specified s pecified in GB 221 - 79 Notations 79 Notations for designation of iron and steel ; and also adds some designations of carbon constructional steel forging and alloy constructional steel forging for general purpose. It ai ms to avoid coinciding with international in designation setting. It also prescribes chemical composition variation and mechanical property according to characteristics of forging by referring to standards both from abroad and home and on the basis of lots of experiments and studies. Sampling location is prescribed in detail referring to standard ASTM A 668, which is s cientific and rational. Those mentioned above make designations, chemical composition of constructional steel forging; chemical composition variation and mechanical property of finished products have nationwide united provisions. To some extent, this standard is brought in line with i nternational standards. Each profession can put forward technical technical provisions based on on provisions of this standard standard and integrating own vocational vocational characteristics characteristics and particular cases. cases. Appendix A of this standard is appendix on standards. This standard was proposed by Ministry of Metallurgical Industry of P.R.C. This standard is under the jurisdiction of Beijing Research Institute of Metallurgy Equipment of Ministry of Metallurgical Industry. This standard was drafted by B eiman Special Steel Co., Ltd., China First Heavy Industries, Beijing Research Institute of Metallurgy Equipment of Ministry of Metallurgical Industry. Chief drafting staffs of this standard: Li Xinghua, Wang Mingjia, and Li Yajun

Anystandards.com

National Standard of the People's Republic of China GB/T 17107 – 1997 1997

Structural Steel Grades and Mechanical Property for Forgings

1 Scope This standard prescribes the designation, chemical composition, product analysis variation, mechanical property and sampling location for mechanical property of constructional steel used for forging. This standard is applicable to general forgings used in equipment of metallurgy, mining, marine accessory accessory and engineering machinery, machinery, and these t hese forgings are sampled for determining mechanical property after bulk heat treatment. Mechanical Mechanical property specified in this standard is n ot applicable to forgings of power station equipment such as principal shaft, shaft, rotor, impeller and pressure pressure vessel which are twirled at high temperature temperature and high speed. speed.

2. Normative references The following standards contain provisions which constitute provisions of this sta ndard through reference in this text. At time of publication, the e ditions indicated were valid. All standards are subject to revision, and parties to agreements agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. GB 223 Methods for chemical analysis of iron steel and alloy. (Refer to a ppendix A) GB 228 – 87 87 Method of metal tensile test GB/T 229 – 94 94 Metallic materials - Charpy notch impact test GB 23l – 23l – 84 84 Metallic materials - Brinell hardness test GB 6397 – 86 86 Metallic materials - Test pieces for tensile testing

3 Designation and chemical compositions 3.1 Designations and chemical compositions (heat analysis) of carbon constructional shall be in a ccordance with provisions in Table 1. 3.2 Designation and chemical composition (heat analysis) of alloy constructional steel s hall be in accordance with provisions in Table Table 2. Contents of sulfur, sulfur, phosphorus, residual copper, copper, chromium chromium and nickel in steel shall shall be in accordance with the provisions of Table 3. Approved by State Bureau of Technical Supervision on 1997.11.11

Anystandards.com Table 1 Carbon Constructional Steel No.

Grade

Chemical Composition %

C

Si

Mn

Cr

Ni

Mo

V

S

P

Cu

Heat Treatment Condition

1

2

3

4

5

Grade

6

Si

Mn

Cr

Ni

Mo

V

S

N/mm

2

N/mm min.

≤100

longitudinal

100~300

longitudinal

300~500

longitudinal longitudinal longitudinal

and tempered

100~300

longitudinal

300~500

longitudinal

normalized,

≤100

longitudinal

or normalized

100~250

longitudinal

and tempered

250~500

longitudinal

500~1000

longitudinal

normalized,

≤100

longitudinal

or normalized

100~250

longitudinal

and tempered

250~500

longitudinal

normalized,

≤100

longitudinal

or normalized

100~300

longitudinal

and tempered

300~500

longitudinal

500~800

longitudinal

J min.

ness HB

continued Cu


Sectional Dimension (Diameter or thickness )mm

Specimen Direction

normalized,

longitudinal

or normalized

longitudinal

and tempered

longitudinal

longitudinal tempering.

longitudinal longitudinal

normalized

tangential

and tempered

tangential tangential tangential

normalized

longitudinal

and tempered


tempering

Mechanical Property

N/mm2 min.

N/mm2 min. % min.

longitudinal

7

Hard 2

% min.

≤100

P

Mechanical Property min.

500~700


C

Specimen Direction

normalized

Table 1 No.



J min.

Table 1 No.

Grade

continued


C

Si

Mn

Cr

Ni

Mo

V

S

P

Cu

6



Specimen Direction

Mechanical Property

N/mm2 min.

N/mm2 min. % min.

normalized,

longitudinal

or normalized

longitudinal

and tempered


tempering.


normalized

tangential

and tempered

tangential tangential tangential

7

normalized

longitudinal

and tempered


tempering


Anystandards.com Table 1 (Continued) No.

8

Gra de


C

Si

Mn

Cr

Ni

Mo

V

S

P

Cu



Specimen Direction

normalized,


and tempered

longitudinal longitudinal longitudinal longitudinal tangential

normalized

tangential

and tempered

tangential tangential longitudinal

9

normalized

longitudinal

and tempered


tempering

N/ mm2 min.

or normalized

tempering

Mechanical Property


Hard

N/mm 2 min. % min.

J min.

ness

HB

J min.


Gra de


C

Si

Mn

Cr

Ni

Mo

V

S

P

Cu

8



Specimen Direction

Mechanical Property

N/ mm2 min.

normalized,

longitudinal

or normalized

longitudinal

and tempered

longitudinal

Hard

N/mm 2 min. % min.

J min.

ness

HB

longitudinal longitudinal tempering

longitudinal tangential

normalized

tangential

and tempered

tangential tangential longitudinal

9

normalized

longitudinal

and tempered


tempering


Anystandards.com

Table 1 (End) No.

Gra de


C

Si

Mn

Cr

Ni

Mo

V

S

P

1

Note:

Cu



Specimen Direction

Mechanical Property

N/mm2 min.

Hard

N/m m2 min. % min.

normalized

longitudinal

and

longitudinal

tempered

longitudinal

J min.

ness

HB

When use steel scrap to smelt designations except that of Q235, Cu content should be no more than 0.30%.

Table 2 Alloy Constructional Steel No.

Grad e


C

Si

Mn

Cr


Ni

Mo

V

Others


Specimen Direction

Mechanical Property

ness

HB N/

tempering mm2 min.

1

normalized

longitudinal

and

longitudinal

tempered 2

tempering

longitudinal longitudinal longitudinal longitudinal

3

normalized

longitudinal

and

longitudinal

tempered

Hard

N/m m2 min. % min.

J min.

Anystandards.com

Table 1 (End) No.

Gra de


C

Si

Mn

Cr

Ni

Mo

V

S

P

1

Note:

Cu



Specimen Direction

Mechanical Property

N/mm2 min.

Hard

N/m m2 min. % min.

normalized

longitudinal

and

longitudinal

tempered

longitudinal

J min.

ness

HB

When use steel scrap to smelt designations except that of Q235, Cu content should be no more than 0.30%.

Table 2 Alloy Constructional Steel No.

Grad e


C

Si

Mn


Cr

Ni

Mo

V

Others


Specimen Direction

Mechanical Property

ness

HB N/

tempering mm2 min.

1

Hard

normalized

longitudinal

and

longitudinal

N/m m2 min. % min.

J min.

tempered 2

tempering


3

normalized

longitudinal

and

longitudinal

tempered


Grade


C

4

Si

Mn

Cr

Ni

Mo

V

others



Specimen Direction

normalized and

longitudinal

tempered

longitudinal

tangential tangential tangential tangential tempering


6

tempering


7

tempering

N/mm2 min.

Hardness

N/mm2 min. % min.

longitudinal

5

Mechanical Property


J min.

HB


Grade


C

Si

Mn

Cr

Ni

Mo

V

others

4



Specimen Direction

Mechanical Property

N/mm2 min.

Hardness

N/mm2 min. % min.

normalized and

longitudinal

tempered

longitudinal

J min.

HB

longitudinal tangential tangential tangential tangential 5

tempering


6

tempering


7

tempering



Grade


C

8

Si

Mn

Cr

Ni

Mo

V

Others


tempering


Specimen Direction

longitudinal

tangential longitudinal longitudinal longitudinal tangential tangential 10

tempering


11

tempering


12

tempering


13

Hard 2

N/mm min.

J min. % min.

tangential

tempering

2

N/mm min.

longitudinal

9

Mechanical Property

normalized

longitudinal

and tempered

longitudinal

ness

HB


Grade


C

Si

Mn

Cr

Ni

Mo

V

Others

8



tempering

Specimen Direction

Mechanical Property 2

N/mm min.

Hard 2

N/mm min.

J min.

ness

HB

% min. longitudinal longitudinal tangential tangential

9

tempering

longitudinal longitudinal longitudinal tangential tangential

10

tempering


11

tempering


12

tempering


13

normalized

longitudinal

and tempered

longitudinal


14

Grad e


C

Si

Mn

Cr

Ni

Mo

V

others



Specimen Direction

normalized

longitudinal

and tempered

longitudinal

tempering


tempering

longitudinal

16

tempering

longitudinal

17

tempering


tempering


19

20

N/m m2 min.

Hard 2

N/mm min.

% min.

15

18

Mechanical Property

normalized

longitudinal

and tempered

longitudinal

quenched and

tangential

tempered

tangential tangential

J min.

ness

HB


Grad e


C

Si

Mn

Cr

Ni

Mo

V

others

14



Specimen Direction

Mechanical Property

Hard 2

N/m m2 min.

N/mm min.

% min.

normalized

longitudinal

and tempered

longitudinal

tempering

longitudinal

J min.

ness

HB

longitudinal 15

tempering

longitudinal

16

tempering

longitudinal

17

tempering


18

tempering

longitudinal

19

normalized

longitudinal

and tempered

longitudinal

20

quenched and

tangential

tempered

tangential

longitudinal

tangential


21

Grad e


C

Si

Mn

Cr

Ni

Mo

V

others


tempering


Specimen Direction

longitudinal


23

tempering

longitudinal longitudinal longitudinal tangential tangential tangential tangential

24

tempering

Hard 2

N/mm min.

% min.

longitudinal tempering

2

N/mm min.

longitudinal

22

Mechanical Property

longitudinal longitudinal longitudinal longitudinal longitudinal

J min.

ness

HB


Grad e


C

Si

Mn

Cr

Ni

Mo

V

others

21



tempering

Specimen Direction


N/mm min.

Hard 2

N/mm min.

% min.

J min.

ness

HB


22

tempering

23

tempering

longitudinal longitudinal longitudinal longitudinal longitudinal tangential tangential tangential tangential

24

tempering



25

Grad e


C

Si

Mn

Cr

Ni

Mo

V

others



tempering

Specimen Direction

longitudinal

longitudinal longitudinal longitudinal tempering


27

carburized and

longitudinal

quenched

and

longitudinal

carburized and

longitudinal

quenched

longitudinal

tempered 28

and

tempered 29

30

longitudinal

carburized and

longitudinal

quenched

longitudinal

tempered

and

N/ mm2 min.

longitudinal

26

Mechanical Property

Hard

2

N/mm min.

% min.

J min.

ness

HB


Grad e


C

Si

Mn

Cr

Ni

Mo

V


others

25


tempering

Specimen Direction

Mechanical Property

N/ mm2 min.

Hard

2

N/mm min.

% min.

J min.

ness

HB


26

tempering


27

carburized and

longitudinal

quenched

and

longitudinal

carburized and

longitudinal

quenched

longitudinal

tempered 28

and

tempered 29

longitudinal

30

carburized and

longitudinal

quenched

longitudinal

and

tempered

Table 2 (Continued) No.

Grad e


C

Si

Mn

Cr

Ni

Mo

V


others

Sectional Dimensio n

Specimen Direction

Mechanical Property

N/m m2 min.

Hard 2

N/mm min.

% min. (Diameter or thickness )mm

31

tempering


32

tempering


33

quantity

tempering


added B

longitudinal

0.001

longitudinal

0.0035


34

quantity added

tempering B


0.001

longitudinal 0.0035

35

tempering


J min.

ness

HB


Grad e


C

Si

Mn

Cr

Ni

Mo

V


others

Sectional Dimensio n

Specimen Direction

Mechanical Property

N/m m2 min.

Hard 2

N/mm min.

% min.

J min.

ness

HB

(Diameter or thickness )mm

31

tempering


32

tempering


33

quantity

tempering


added B

longitudinal

0.001

longitudinal

0.0035


quantity

34

added

tempering B


0.001

longitudinal 0.0035

35

tempering



Grad e


C

Si

Mn

Cr

Ni

Mo

V

others



Specimen Direction

tempering

37

tempering

longitudinal

38

normalized

longitudinal

and tempered

longitudinal

normalized

longitudinal

and tempered

longitudinal


longitudinal longitudinal 40

tempering

longitudinal tangential

41

tempering

42

tempering

tangential longitudinal longitudinal longitudinal longitudinal

43

tempering

N/m m2 min.

Hard 2

N/mm min.

% min.

36

39

Mechanical Property


J min.

ness

HB


Grad e


C

Si

Mn

Cr

Ni

Mo

V

others


36

tempering

37

tempering


Specimen Direction

Mechanical Property

N/m m2 min.

Hard 2

N/mm min.

% min.

J min.

ness

HB


38

39

normalized

longitudinal

and tempered

longitudinal

normalized

longitudinal

and tempered


40

tempering

41

tempering

42

tempering

longitudinal tangential tangential longitudinal longitudinal longitudinal longitudinal

43

tempering



Grad e


C

Si

Mn

Cr


Ni

Mo

V

others


Specime n Directio n

Mechanical Property

Hard ness

HB 2

N/mm min.

2

N/mm min.

% min. 44

tempering


45

quenched and

longitudinal

tempered


tempering


46

tempering


47

tempering


48

carburized

longitudinal

and quenched

longitudinal

and tempered

J min.


Grad e


C

Si

Mn

Cr


Ni

Mo

V

others



Mechanical Property

Hard ness

HB N/mm2 min.

N/mm2 min. % min.

44

tempering

J min.


45

quenched and

longitudinal

tempered


tempering


46

tempering


47

tempering


48

carburized

longitudinal

and quenched

longitudinal

and tempered


49

50

Grad e


C

Si

Mn

Cr

Ni

Mo

V

others




tempering

longitudinal

carburized

longitudinal

and quenched

longitudinal

and tempered 51

tempering


52

tempering


53

tempering


54

tempering



N/mm min.

Hard 2

N/mm min.

% min.

J min.

ness

HB


Grad e


C

Si

Mn

Cr

Ni

Mo

V

others




49

tempering

longitudinal

50

carburized

longitudinal

and quenched

longitudinal


N/mm min.

Hard 2

N/mm min.

% min.

J min.

ness

HB

and tempered 51

tempering


52

tempering


53

tempering


54

tempering


Anystandards.com Table 2 (End) No.

55

Grad e


C

Si

Mn

Cr

Ni

Mo

V

others


tempering


Specimen Direction

longitudinal

longitudinal longitudinal tempering


57

N/m m2 min.

2

N/mm min.

% min.

longitudinal

56

Mechanical Property

quenched

longitudinal

and

longitudinal

tempered


J min.

Hard ness HB

Anystandards.com Table 2 (End) No.

Grad e


C

Si

Mn

Cr

Ni

Mo

V


others

55


tempering

Specimen Direction

Mechanical Property

N/m m2 min.

2

N/mm min.

J min.

% min.

Hard ness HB


56

tempering


57

quenched

longitudinal

and

longitudinal

tempered


Anystandards.com GB/T 17107-1997 Table 3 Sulphur, Phosphorus and Residual Copper, Chromium and Nickel Content in Alloy Constructional Steel Code Name

Steel Class

P

S

Cu

Cr

Ni

%min. High-quality Steel

-

0.035

0.035

0.30

0.30

0.30

Advanced

A

0.025

0.025

0.25

0.30

0.30

E

0.0.25

0.015

0.25

0.30

0.30

High-quality Steel Super High-quality Steel

4 Chemical composition variations of finished products 4.1 Chemical composition variations of finished products carbon constructional steel forging should be in accordance with the provisions in Table 4, alloy constructional steel forging should be in accordance with the provisions in Table 5. 4.2 When chemical compositions analysis of finished products is required, acquirers shall make specimens form t he forge piece f or its extended parts, from between 1/2 radius and external surface for disk forgings or solid forgings, from between 1/2 wall thickness and external surface for hollow f orgings or ring forgings.

Table 4 Chemical Composition Variations of Carbon Constructional Steel Forging Element

Rated

Cross Sectional Area, cm 2

Maximum Range %

Allowable variations that exceed upper or lower limits %

Anystandards.com GB/T 17107-1997 Table 3 Sulphur, Phosphorus and Residual Copper, Chromium and Nickel Content in Alloy Constructional Steel Code Name

Steel Class

P

S

Cu

Cr

Ni

%min. High-quality Steel

-

0.035

0.035

0.30

0.30

0.30

Advanced

A

0.025

0.025

0.25

0.30

0.30

E

0.0.25

0.015

0.25

0.30

0.30

High-quality Steel Super High-quality Steel

4 Chemical composition variations of finished products 4.1 Chemical composition variations of finished products carbon constructional steel forging should be in accordance with the provisions in Table 4, alloy constructional steel forging should be in accordance with the provisions in Table 5. 4.2 When chemical compositions analysis of finished products is required, acquirers shall make specimens form t he forge piece f or its extended parts, from between 1/2 radius and external surface for disk forgings or solid forgings, from between 1/2 wall thickness and external surface for hollow f orgings or ring forgings.

Table 4 Chemical Composition Variations of Carbon Constructional Steel Forging Element

Rated


Maximum Range %


Table 5 Chemical Composition Variations of Alloy Constructional Steel Forging Element

Rated


Maximum Range %


Anystandards.com GB/T 17107-1997

Table 5 Element

End Cross Sectional Area, cm 2

Rated Maximum Range %


5 Mechanical Properties 5.1 Mechanical properties of carbon constructional steel forging should be in accordance with the provisions in Table 1. 5.2 Mechanical properties of alloy constructional steel forging should be in accordance with the provisions in Table 2. 5.3 Mechanical properties of forgings must be t ested after property heat treatment and before surface treatment. 5.4 When specimens have been taken, no heat treatment that affects the mechanical properties or machining that affects test results is allowed. 5.5 Mechanical properties mainly include tension, impact property and hardness of materials. When conducting tension, impact and hardness tests at the same time, hardness value can be used for reference. Also can conduct a certain test of tension, impact or hardness. 5.6 When using transverse, tangential or radial specimens to measure mechanical properties of forging, mechanical properties is allowed to be lower than the numerical value of longitudinal mechanical properties, the degree of reduce is shown as Table 6.


Table 6 Mechanical

Specimen

Acid Open-hearth Furnace

Property

Direction

and Electrical Steel

Index

Forging Ratio ≤5

>5

Basic Open-hearth Steel

1-25t steel ingot forging

2~3

3~5

>25t steel ingot forging

>5

2~3

3~5

>5

Allowable percentage to reduce mechanical properties, %

tangential transverse tangential transverse tangential transverse tangential transverse tangential transverse

6. The sampling position of mechanical properties. 6.1 The mechanical properties specimen should be sa mpled from forgings or the lengthened, extended or thickened parts. The dimensions of lengthened, extended or thickened parts are determined by the nominal diameter or thickness of forgings through rough machining, regardless of their thick ends, shoulders, flanges or journals. For axial forgings having been normalized and tempered, the sampling position can be the extend parts of minor diameter ’s axle heads. As shown in Figure 1. 6.2 Mechanical property are allowed to take samples from rough specimens form the same heat and through one heat treatment. The dimension of such rough specimens is equivalent to that of forgings’ sampling position. 6.3 For forging longitudinal tension testing specimens, positions of the center of gauge length or axis of tangential tension specimen and impact notch of specimen should by determined by one of the following methods. a) For solid axial forgings, the sampling position of is at 1/3 radius position from the surface; for square and oblong forgings, 1/3 of the section diagonal line staring from the end. For forgings which undergo quenching, 90mm from the end or dimension position equals to 1/2 diameter or of the thickness (take the smaller value of t hese two), see Figure 1a. b) For hollow forgings, the sampling position should be at 1/2 wall thickness; for forgings which undergo quenching, 90mm from the end or position equals to 1/2 wall thickness dimension (take the smaller value of t hese two), see Figure 1b. c) For disc forgings, when the specimen is the extension part of the external diameter, the sampling position is at 1/2 height; for forgings which undergo quenching, 90mm from the external diameter or dimension equals to 1/2 height (take the smaller value of these two). When the specimen is the height thickened part, the sampling position is at 1/2 height, but for forgings which undergo quenching, 90mm from the each surface or position equals to 1/2 thickness (take the smaller value of these two), see Figure 1c. d) For ring forgings, when the specimen is the extension part of height, the sampling position is at 1/2 well thickness, for forgings which undergo quenching, 90mm from the ring end face or dimension equals to 1/2 wall t hickness (take the smaller value of these two). When the specimen is the height thickened part, the sampling position is at 1/2 height, but for forgings which undergo quenching, 90mm from the external diameter or dimension equals t o 1/2 height (take the smaller value of these two), see Figure 1d. 6.4 The sampling position of traverse specimens should in accordance with purchaser’s drawings. 6.5 For specially required forgings, the sampling positions of mechanical property should be agreed by both supplier and purchaser.

Anystandards.com GB/T 17107-1997 6.6 Forgings which undergo normalizing or normalizing and te mpering, heat-affected areas and sections can not be omitted.

Extension part

Tangential specimen

Longitudinal specimen

annealing, normalizing


Extension part Tangential specimen

Quenching, tempering


a. Axis or square, oblong forging Tangential specimen Extension part

Longitudinal specimen b.

hollow forging

Extension part

Tangential specimen

Tangential specimen c.

disc forging

Figure 1. Sampling position of forgings


t r a p n o i s n e t x E

Extension part

Tangential specimen Tangential specimen c. ring

forging

Figure 1 End

7 Specimens Dimension of forgings tension and impact specimens should be in accordance with provisions in GB 6397, GB/T 229. 8 Test Methods

8.1 Chemical analysis testing should be in accordance with provisions in standards of Annex A (Normative Annex). 8.2 Tension testing should be in accordance with provisions in GB 228. 8.3 Impact testing should be in accordance with provisions in GB/ T 229. 8.4 Hardness testing should be in accordance with provisions in GB 231. 9. Sampling Number

Sampling number of forging steels should meet the requirements for technical standard of products.

Anystandards.com GB/T 17107-1997 Annex A (Normative Annex) Methods for Chemical Analysis Normative references

GB 223.3-88 Method for Chemical analysis of iron, steel and alloy - The diantipyryl methane phosphomolybdate gravimetric method for the determination of phosphorus content. GB 223.5-88 Methods for Chemical Analysis of Iron, Steel and Alloy--The Oxalate-ferrous Sulfate Molybdosilicate Spectrophotometric Method for the Determination of Silicon Content GB/T 223.6-94 Methods for chemical analysis of iron, steel and alloy. The neutralization titrimetric method for the determination of boron content GB/T 223.11-91 Methods for Chemical Analysis of Iron, Steel and Alloy - The Ammonium Persulfate Oxidation Volumetric Method for t he Determination of Chromium Content GB/T 223.12-91 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Carbonate Separation-diphenyl Carbazide Photometric Method for t he Determination of Chromium Content GB 223.13-89 Methods for Chemical Analysis of Iron, Steel and Alloy-The Ammonium Ferrous Sulfate Titration Method for the Determination of Vanadium Content GB

223.14-89

Methods

for

Chemical

Analysis

of

Iron,

Steel

and

Alloy

-

the

N-benzoy-n-phenylhydroxylamine Extraction Photometric Method for the Determination Of Vanadium Content GB/T 223.16-91 Methods for chemical analysis of iron, steel and alloy － The chromotropic acid photometric method for the determination of titanium content GB/T 223.18-94 Methods for chemical analysis of iron ，steel and alloy--The sodium thiosulfate separation iodimetric method for the determination of copper content GB 223.19-89 Methods for Chemical Analysis of Iron Steel and Alloy; The Neocuproine-chloroform Extraction Photometric Method for the Determination of Copper C ontent GB/T 223.23-94 Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content GB/T 223.24-94 Methods for Chemical Analysis of Iron, Steel and Alloy.the Extraction Seperation - The Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content GB/T 223.25-94 Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content GB 223.26-89 Methods for Chemical Analysis of Iron Steel and Alloy - The Thiocyanate Direct Photometric Method for the Determination of Molybderum Content GB/T223.39-94 Methods for chemical analysis iron,steel and alloy The s ulphochlorophenol S photometric method for the determination of niobium content GB/T223.43-94 Methods for chemical analysis of iron,steel and alloy Determination of tungsten content GB 223.53-87 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content. GB 223.54-87 Methods for Chemical Analysis of Iron, Steel and Alloy--The Flame Atomic Absorption Spectrophotometric Method for the Determination of Nickel Content GB 223.58-87 Methods for Chemical Analysis of Iron, Steel and Alloy--The Sodium Arsenite-sodium Nitrite Titrimetric Method for the Determination of Manganese Content GB 223.59-87 Methods for Chemical Analysis of Iron, Steel and Alloy--The Reduced Molybdoantimonyl Phosphoric Acid Photometric Method for the Determination of Phosphorus Content GB 223.60-87 Methods for Chemical Analysis of Iron, Steel and Alloy--The Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon Content GB 223.61-88 Methods for Chemical Analysis of Iron, Steel and Alloy--The Ammonium Phosphomolybdate Volumetric Method for the Determination of Phosphorus Content GB 223.62-88 Methods for Chemical Analysis of Iron, Steel and Alloy--The Butyl Acetate Extraction

Photometric Method for the Determination of Phosphorus Content GB 223.63-88 Methods for Chemical Analysis of Iron, Steel and Alloy--The Sodium (potassium) Periodate Photometric Method for the Determination of Manganese Content GB 223.64-88 Methods for Chemical Analysis of Iron, Steel and Alloy--The Flame Atomic Absorption Spectrometric Method for the Determination of Manganese Content GB 223.66-89 Methods for chemical analysis of iron ，steel and alloy--The thiocyanate chlorpromazine hydrochloride--chloro form extraction photometric method for the determination of tungsten content GB

223.67-89

Methods

for

Chemical

Analysis

of

Iron,

Steel

and

Alloy--The

Reducing

Distillation-methylene Blue Photometric Method for the Determination of Sulfur Content GB 223.68-89 Methods for Chemical Analysis of Iron, Steel and Alloy--The Combustion Potassium Iodate Volumetric Method for the Determination of Sulfur Content GB 223.69-89 Methods for Chemical Analysis of Iron, Steel and Alloy--The Gas-Volumetric Method after Combustion for the Determination of Carbon Content GB/T 223.72-91 Methods for Chemical Analysis of Iron, Steel and Alloy--The Alumina Chromatographic Separation-barium Sulfate Gravimetric Method for the Determination of Sulphur Content GB/T 223.72-91 Methods for chemical analysis of iron ， steel and alloy--The methanol distillation-curcuminphotometric method for the determination of boron content

GB T 17107-1997 Structural Steel Grades and Mechanical Property for Forgings

Recommend Documents