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JB/T 5000.6-2007General technical requirements for heavy machinery - Part 6: Steel castings (English PDF)

重型机械通用技术条件第6部分：铸钢件

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

August 28, 2007

Implementation date

February 1, 2008

Scope

JB/T 5000.6-2007 is the English-translated version of 重型机械通用技术条件第6部分：铸钢件.

JB/T 5000.6-2007 is the Chinese standard "General technical requirements for heavy machinery - Part 6: Steel castings". Its scope clause reads: This part of JB/T 5000 specifies the technical requirements, test methods. inspection rules, marks and packing of the carbon and low alloy steel castings for heavy machinery.

This part is applicable to the carbon and low alloy steel castings cast in sand mould or the casting mould with equivalent thermal conductivity with the sand mould.

This part is not applicable to such special steel grades as high manganese steel, heat-resistant steel and stainless steel. Its clauses include technical requirements.

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Document preview — JB/T 5000.6-2007

National Standard of the People's Republic of China

Replacing: JB/T 5000.6-1998

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword I
1 Scope
2 Normative References
3 Specifications
3.1 Grade, chemical composition and mechanical property
3.2 Surface quality
3.3 Repair welding
3.4 Dimensional tolerance
3.5 Finishing allowance
3.6 Weight deviation
3.7 Pattern draft
3.8 Tortuosity ratio
4 Test Methods and Test Rules
4.1 Chemical analysis
4.2 Mechanical test
4.3 Surface inspection
4.4 Dimension inspection
5 Marks and Packing
5.1 Marks and quality certificate
5.2 Painting and packing
Figure 1 Dimensional Tolerance and Extreme Dimension
Figure 2 Maximal Shifting
Figure 3 Maximal Overall dimension of Finished Casting after Final Mechanical Processing
Figure 4 Cast Steel Disc
Figure 5 Single-cast Test Block for Mechanical Property
Table 1 Chemical Composition of Carbon Steel
Table 2 Mechanical Property of Carbon Steel
Table 3 Chemical Composition of Low-alloy Steel
Table 4 Mechanical Property of Low-alloy Steel
Table 5 Roughness of Cast Surface
Table 6 Cutting Surplus of Casting Head
Table 7 Dimensional Tolerance Value of Casting
Table 8 Finishing Allowance
Table 9 Blank Dimension of Cast Steel Disc
Table 10 Weight Deviation of Casting
Table 11 Tortuosity Ratio of Casting

1 Scope

This part of JB/T 5000 specifies the technical requirements, test methods. inspection rules, marks and packing of the carbon and low alloy steel castings for heavy machinery.

This part is applicable to the carbon and low alloy steel castings cast in sand mould or the casting mould with equivalent thermal conductivity with the sand mould.

This part is not applicable to such special steel grades as high manganese steel, heat-resistant steel and stainless steel.

2 Normative References

The following normative documents contain provisions which, through reference in this part of JB/T 5000, constitute provisions of this part. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this part are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative document referred to applies.

GB/ T 222 Permissible Tolerances for Chemical Composition of Steel Products

GB/T 223 (all) Methods for Chemical Analysis of Iron, Steel and Alloy

GB/T 228 Tensile Test Methods on Metal (GB/T 228-2002, eqv ISO 6892: 1998)

GB/T 229 Metallic Materials - Charpy Notch Impact Test (GB/T 229-1994, eqv ISO 148: 1983)

GB/T 231.1 Metallic Materials - Brinell Hardness Test [GB/T 231.I- 2002, eqv ISO 6506-1: 1999 (E)]

GB/T 6060.1 Roughness Comparison Specimens Cast Surfaces (GB/T 6060.1-1997, eqv ISO 2632-3: 1979)

GB/T 6414-1999 Castings - System of Dimensional Tolerances and Machining Allowances (eqv ISO 8062: 1994)

GB/T l5056 Evaluation Method on Cast Surface Roughness

JB/T 5000.7 Heavy Mechanical General Techniques and Standards - Part 7: Repair Welding for Steel Castings

JB/T 5000.12 Heavy Mechanical General Techniques and Standards - Part 12: Paint

JB/T 5000.13 Heavy Mechanical General Techniques and Standards - Part 13: Packing

JB/T 5105 Pattern Draft of Casting Form

JB/T 6397-2006 Specification for the Heavy Carbon Structural Steel Forgings

3 Technical Requirements

3.1 Grade, chemical composition and mechanical property

3.1.1

The grade, chemical composition and mechanical property of carbon steel shall be in accordance with those specified in Tables 1 and 2.

3.1.2

The grade, chemical composition and mechanical property of low-alloy steel shall be in accordance with those specified in Tables 3 and 4.

3.2 Surface quality

3.2.1

The sand fusion, sand inclusion, flash, burr, gating and risering and the oxide coating on the castings shall be removed cleanly.

3.2.2

The roughness of cast surface shall be in accordance with those specified in Table 5.

Table 1 Chemical Composition of Carbon Steel

Material grade Mass fraction(%) <=

C Si Mn S P Residual element

Ni Cr Cu Mo V

ZG200-400 0.20 0.50 0.80 0.04 0.04 0.30 0.35 0.30 0.20 0.05

ZG230-450 0.30 0.90

ZG270-500 0.40

ZG310-570 0.50 0.60

ZG340-640 0.60

NOTE 1: Each grade may be added with 0.04% of manganese when reducing per 0.01% of carbon, manganese of ZG 200-400 shall be 1.00% at most, that of the rest four grades shall be 1.20% at most.

NOTE 2: The gross amount of residual element shall not be larger than 1.00%. The residual elements may not be analyzed if not required by the buyer.

Table 2 Mechanical Property of Carbon Steel

Material grade Mechanical property>=

Yield point or yield strength

MPa Tensile strength MPa

Elongation

% Shrinkage factor

% Impact absorbing energy

ZG200-400 200 400 25 40 30 47

ZG230-450 230 450 22 32 25 35

ZG270-500 270 500 18 25 22 27

ZG310-570 310 570 15 21 15 24

ZG340-640 340 640 10 18 10 16

NOTE 1: The supplier may choose any one from and if not required by the buyer.

NOTE 2: The properties of each grade listed in the above table are applicable to the castings with thickness not larger than 100mm. And the yield strength specified in the table are only for design reference if the thickness of casting is larger than 100mm.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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Editions of JB/T 5000.6

Edition	Title	Revision	Status
JB/T 5000.6-2007	General technical requirements for heavy machinery - Part 6: Steel castings	current edition	Current
JB/T 5000.6-1998	General technical requirements for heavy machinery - Part 6: Steel castings	previous edition	Superseded

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