GB/T 6967-2009 English PDF (GB/T6967-2009)

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GB/T 6967-2009: Martensitic stainless steel castings for general engineering application
GB/T 6967-2009
Martensitic stainless steel castings for general engineering application
ICS 77.140.80
J31
National Standards of People's Republic of China
Replacing GB/T 6967-1986
Structural engineering, the high-strength stainless steel castings
(ISO 11972.1998, Corrosion-resistantcaststeelsforgeneralapplications,
ISO 4990.2003, Steelcastings-Generaltechnicaldeliveryrequirements, MOD)
Posted 2009-03-05
2009-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This revised standard adopts ISO 11972.1998 "General purpose corrosion resistant steel" and ISO 4990.2003 "Common technical steel castings delivery
Member ", and reference DINEN10293.2005" Steel castings for general engineering purposes "and other foreign standards, some of the terms.
This standard ISO 3755.1991 and ISO 4990.2003 merge the changes adopted, there is a major difference in the technical content.
--- Made larger editorial changes in the structure, modified ISO 11972.1998, Chapter 6, Section 7 chapters, Chapter 6 heat
Change management process is determined by the supplier; Chapter 7 Supplementary requirements amend Chapter 3 of this standard.
--- Remove the ISO 4990.2003 in Table 1 and Table 2 tolerance chemical composition of materials substitution; revised Appendix B of the force
Properties test block specifications, sampling location and size.
This standard replaces GB/T 6967-1986 "structural engineering, the high-strength stainless steel castings," compared with the GB/T 6967-1986, the main
To technical content revisions are as follows.
--- Addition of two high-strength ultra-low carbon stainless steel castings and grades ZG04Cr13Ni4Mo ZG04Cr13Ni5Mo, delete ZG06Cr13Ni6Mo
Grades;
--- Increasing the low-temperature impact energy and cold bending performance requirements;
--- Increase liquid steel purity requirements;
--- Refining process to increase the use of high strength and high toughness stainless steel casting grades.
This standard by the National Standardization Technical Committee Cast and centralized.
This standard is drafted by. Shenyang Foundry Research Institute, Ningxia shared Group LLC.
Participated in the drafting of this standard. Dongfang Electric Group, Dongfang Electrical Machinery Co., Ltd., China First Heavy Machinery Group Company Tianjin R and D
Heart, China's second Heavy Machinery Group Corporation, Harbin Electric Machinery Co., Ltd.
The main drafters of this standard. Lou Yanchun, Zhang Zhongqiu, Hao Lichang, Madsen, Ya-only, Xiao Zhang Yu, Zhang Jiashu.
This standard replaces the standards previously issued as follows.
--- GB/T 6967-1986.
Structural engineering, the high-strength stainless steel castings
1 Scope
This standard specifies the use of engineering structures, high strength martensitic stainless steel castings of technical requirements, test methods, inspection rules and signs, including
Loading and storage.
This standard applies to engineering structures with high strength martensitic stainless steel castings.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 222 chemical composition of finished steel tolerance
GB/T 223.3 steel and alloy chemical analysis method two antipyrine methane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.4 steel and alloy - Determination of manganese content or visual titration potentiometric titration
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 228 metal materials at room temperature tensile test method (GB/T 228-2002, eqv ISO 6892.1998)
GB/T 229 metal Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1.2006, MOD)
GB/T 231.1 Brinell hardness test - Part 1. Test method (GB/T 231.1-2002, eqv ISO 6506-1.
1999)
GB/T 231.2 Brinell hardness test - Part 2. Verification and calibration of hardness (GB/T 231.2-2002,
ISO 6506-2.1999, MOD)
GB/T 231.3 Brinell hardness test - Part 3. Calibration standard hardness block (GB/T 231.3-2002, ISO 6506-
3.1999, MOD)
GB/T 4336 carbon steel and low alloy steel spark source atomic emission spectrometry method (conventional method)
GB/T 5677 Steel Castings radiographic testing (GB/T 5677-2007, ISO 4993. 1987, IDT)
GB /6060.1 T Surface roughness comparison specimens cast surface (GB/T 6060.1-1997, eqv ISO 2632-3. 1979)
GB/T 6414 casting dimensional tolerances and machining allowances (GB/T 6414-1999, eqv ISO 8062.1994)
GB/T 7233 steel ultrasonic testing and quality rating system
GB/T 9443 Steel Castings penetrant inspection (GB/T 9443-2007, ISO 4987.1992, IDT)
GB/T 9444 Steel Castings Magnetic particle testing (GB/T 9444-2007, ISO 4986.1992, IDT)
3 order request
3.1 acquirer should clearly define the criteria used in the contract or order agreement, material grades, the number of the corresponding technical requirements, test items
Head and delivery status, providing ordering pattern to suppliers.
3.2 When the demand side than the proposed additional requirements of this standard shall be agreed between confirm.
4. Technical Requirements
4.1 Chemical composition
4.1.1 The chemical composition of each steel grade should meet the requirements in Table 1.
4.1.2 Unless otherwise specified, the content of residual elements not as a basis for acceptance.
4.1.3 ZG04Cr13Ni4Mo and ZG04Cr13Ni5Mo, its refining steel liquid gas content should be controlled. [H] ≤3 × 10-6, [N]
≤200 × 10-6, [O] ≤100 × 10-6. Unless otherwise specified, the gas content is not as a basis for acceptance.
Table 1 chemical composition mass fraction,%
Steel Grade C
Si
(≤)
Mn
(≤)
(≤)
(≤)
Cr Ni Mo
Residual elements (≤)
Total Cu V W
ZG20Cr13 0.16 ~ 0.240.80 0.80 0.0350.02511.5 ~ 13.5 - - 0.500.050.100.50
ZG15Cr13 ≤0.15 0.80 0.80 0.0350.02511.5 ~ 13.5 - - 0.500.050.100.50
ZG15Cr13Ni1 ≤0.15 0.80 0.80 0.0350.02511.5 ~ 13.5 ≤1.00 ≤0.50 0.500.050.100.50
ZG10Cr13Ni1Mo ≤0.10 0.80 0.80 0.0350.02511.5 ~ 13.5 0.8 ~ 1.80 0.20 ~ 0.500.500.050.100.50
ZG06Cr13Ni4Mo ≤0.06 0.80 1.00 0.0350.02511.5 ~ 13.5 3.5 ~ 5.0 0.40 ~ 1.000.500.050.100.50
ZG06Cr13Ni5Mo ≤0.06 0.80 1.00 0.0350.02511.5 ~ 13.5 4.5 ~ 6.0 0.40 ~ 1.000.500.050.100.50
ZG06Cr16Ni5Mo ≤0.06 0.80 1.00 0.0350.02515.5 ~ 17.0 4.5 ~ 6.0 0.40 ~ 1.000.500.050.100.50
ZG04Cr13Ni4Mo ≤0.04 0.80 1.50 0.0300.01011.5 ~ 13.5 3.5 ~ 5.0 0.40 ~ 1.000.500.050.100.50
ZG04Cr13Ni5Mo ≤0.04 0.80 1.50 0.0300.01011.5 ~ 13.5 4.5 ~ 6.0 0.40 ~ 1.000.500.050.100.50
4.2 Mechanical Properties
4.2.1 mechanical properties of each steel grades shall conform to the provisions of Table 2.
Table 2 Mechanical Properties
Steel grades
Yield strength Rp0.2 /
MPa (≥)
Tensile strength Rm /
MPa (≥)
Elongation A5 /%
(≥)
Reduction of Z /
% (≥)
Impact energy AKV /
J (≥)
Brinell hardness
HBW
ZG15Cr13 345 540 18 40 - 163 ~ 229
ZG20Cr13 390 590 16 35 - 170 ~ 235
ZG15Cr13Ni1 450 590 16 35 20 170 ~ 241
ZG10Cr13Ni1Mo 450 620 16 35 27 170 ~ 241
ZG06Cr13Ni4Mo 550 750 15 35 50 221 ~ 294
ZG06Cr13Ni5Mo 550 750 15 35 50 221 ~ 294
ZG06Cr16Ni5Mo 550 750 15 35 50 221 ~ 294
ZG04Cr13Ni4Mo
HT1a 580 780 18 50 80 221 ~ 294
HT2b 830 900 12 35 35 294 ~ 350
ZG04Cr13Ni5Mo
HT1a 580 780 18 50 80 221 ~ 294
HT2b 830 900 12 35 35 294 ~ 350
a tempering temperature should be 600 ℃ ~ 650 ℃.
b tempering temperature should be 500 ℃ ~ 550 ℃.
4.2.2 Table 2 grades ZG15Cr13, ZG20Cr13, ZG15Cr13Ni1 steel mechanical properties suitable for wall thickness less than or equal to
150mm castings. Grades ZG10Cr13Ni1Mo, ZG06Cr13Ni4Mo, ZG06Cr13Ni5Mo, ZG06Cr16Ni5Mo,
ZG04Cr13Ni4Mo, ZG04Cr13Ni5Mo cast steel suitable for wall thickness less than or equal to 300mm castings.
When 4.2.3 ZG04Cr13Ni4Mo (HT2), ZG04Cr13Ni5Mo (HT2) for medium-sized castings cast welding structure, supply and demand sides should another
Line agreed.
4.2.4 demand side do low-temperature impact test, the technical requirements agreed upon by both parties. Wherein ZG06Cr16Ni5Mo,
ZG06Cr13Ni4Mo, ZG04Cr13Ni4Mo, ZG06Cr13Ni5Mo ZG04Cr13Ni5Mo temperature is 0 ℃ and the impact energy should
In accordance with Table 2.
4.2.5 To make cold bend test, to be agreed by both parties.
4.3 Manufacturing
4.3.1 Melting
Unless otherwise specified, the melting method chosen by the supplier. But ZG04Cr13Ni4Mo and ZG04Cr13Ni5Mo two grades should be used
Liquid steel refining process, such as vacuum oxygen decarburization (VOD), argon oxygen decarbonization (AOD) refining or other methods.
4.3.2 Casting
Unless otherwise specified, the casting process is determined by the supply side.
4.3.3 Heat Treatment
Castings must be subjected to heat treatment. Unless otherwise specified, the heat treatment process is determined by the supply side.
4.4 Elimination of defects and welding
4.4.1 allows casting defects repair welding, the need to clean up before welding defect all clean, exposed metal surface density, and by magnetic particle inspection or penetration
Test, confirm compliance with the requirements of welding, before welding.
Welding by a qualified operator 4.4.2 casting defects by welding process requirements.
4.4.3 welding consumables with the same material is divided into martensitic stainless steel or austenitic stainless steel welding consumables welding consumables. General shall, after the heat treatment performance
Perform welding. Welding type is different from the base material agreed upon by both parties. It normally takes before welding welding procedure qualification, and has been recognized by the demand side.
4.4.4 large welding defects prior consent should the demand side.
4.4.5 pit prepared for the welding, casting a depth of more than 20% of the wall thickness or 25mm person (whichever is smaller); or when the pressure
When casting leakage pressure test, it shall be deemed to larger defects.
4.4.6 large defects after welding stress relief heat treatment should be carried out, according to the testing standards for testing casting, welding confirm eligibility.
4.5 casting dimensional tolerances and surface roughness
4.5.1 casting dimensional tolerances and allowances should be consistent with drawings or protocols, such as drawings or no agreement stipulates casting dimensional tolerances
And allowance shall comply with GB/T 6414's.
4.5.2 casting surface roughness shall comply with GB/T 6060.1 of.
4.6 casting surface quality
Casting should trim burr removal Riser. Sticky surface should be cleared of sand and scale.
5 Test methods
5.1 Chemical composition
Sampling methods for chemical analysis according to the provisions of GB/T 222 implementation, spectral analysis performed in the provisions of GB/T 4336, and the chemical composition of arbitration
Analysis of the implementation according to the provisions GB/T 223's.
5.2 Tensile test
Tensile test performed in the provisions of GB/T 228's.
5.3 Impact test
Impact test performed in the provisions of GB/T 229's.
5.4 Hardness Test
Hardness test performed in the provisions of GB/T 231.1 ~ 223.3 in.
5.5 NDT
5.5.1 Unless otherwise specified, the casting surface of the magnetic particle testing performed in the provisions of GB/T 9444's.
5.5.2 Unless otherwise specified, the casting penetrant testing performed in the provisions of GB/T 9443's.
5.5.3 Unless otherwise specified, to perform ultrasonic testing of castings according to the provisions of GB/T 7233's.
5.5.4 Unless otherwise specified, perform radiographic testing of castings according to the provisions GB/T 5677's.
6 Inspection rules
6.1 Chemical composition test
Chemical composition should be secondary smelting furnace by furnace inspection. Chemical assay to attach the test block or casting furnace with separate times cast test block
The sampling prevail and allow sampling in the ladle. Analysis of samples should be taken at least 6mm specimen or below the surface of the casting.
When a multi-packet pouring castings, each package must be analyzed, and the results of the analysis of each package shall meet the technical requirements of the selected brands.
6.2 Mechanical performance test
6.2.1 mechanical properties of a sample for testing shall be taken from the casting or attached test block with cast furnace separate occasions cast test block, and they represent a cast
Member with heat treatment furnace. Single-cast test block main dimensions and cut the sample position shown in Figure 1.
6.2.2 attached test block attached casting cast parts is determined by the size and number of suppliers. For parties have special requirements, agreed upon by both parties.
Millimeters
Mechanical Properties Figure 1 with a single cast test block type
6.2.3 Mechanical Properties with specimen thickness should ≥28mm (including by mutual agreement, in the casting cut test block).
6.2.4 Each and every time the furnace heat treatment furnace at least once to take a tensile specimen.
6.2.5 Impact test each batch by taking three impact test specimens, the average of three impact specimens shall comply with the provisions of Table 2. Three
The impact of the sample, allowing only a sample of the shock table is below a second predetermined value, but not less than 2/3 of a predetermined value.
6.3 reinspection
6.3.1 Take two spare tensile test specimens from the same time in the furnace. If both test results are consistent with the provisions of Table 2, the second casting furnace
Tensile Properties member remains qualified. Ruofu experiments a sample still unsatisfactory results, then press for only 6.4 process.
6.3.2 Take three alternate from the same heats the impact of the sample tested, the results with the original results are added back to calculate the average. If the new
Ave...