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GB/T 1220-2007 English PDF (GBT1220-2007)

GB/T 1220-2007 English PDF (GBT1220-2007)

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GB/T 1220-2007: Stainless steel rod

This Standard specifies the dimensions, shape, technical requirements, test methods, inspection rules, packing marks, and certificate quality of stainless steel bars (generic terms of round steel, square steel, flat steel, hexagonal steel and octagonal steel. This Standard is applicable to the hot rolled and forged steel bars of which the dimension (diameter, side length, thickness or subtense distance) is no more than 250mm. Through negotiations of both the Supplier and Buyer, it may also supply the hot rolled and forged steel bars of which the dimension is more than 250mm.
GB/T 1220-2007
GB
ICS 77.140.20
H 40
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
Replacing GB/T 1220-1992
Stainless Steel Bars
ISSUED ON. MAY 14, 2007
IMPLEMENTED ON. DECEMBER 01, 2007
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China; Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
1. Scope ... 6
2. Normative References ... 6
3. Terms and definitions ... 10
4. Contents in order sheet ... 10
5. Classification ... 10
6. Dimension, shape, weight and permissible deviation ... 11
7. Technical requirements ... 12
7.1 Grade and chemical components ... 12
7.2 Melting method... 12
7.3 Delivery state ... 12
7.4 Mechanical properties ... 12
7.5 Corrosion resistance ... 25
7.6 Macro structure ... 26
7.7 Hot forging ... 26
7.8 Surface quality ... 26
7.9 Special requirements ... 27
8. Test methods ... 27
9. Inspection rules ... 28
9.1 Inspection and acceptance ... 28
9.2 Lot organization rules ... 28
9.3 Sampling position and sampling quantity ... 28
9.4 Rules for re-inspection and determination ... 28
10. Packing, marking and quality certificate ... 29
Annex A ... 30
Annex B ... 33
Foreword
This Standard replaces GB/T 1220-1992 Stainless steel bars.
In comparison with Standard GB/T 1220?€?1992, main changes of this Standard include the following points.
??? Add the ?€?Technical terms and definitions?€? and ?€?Contents in order sheet?€? (See Chapter 3 and Chapter 4);
??? ?€?Dimensions, shape, weight and permissible deviation?€? is changed to direct quotation of stipulations specified in universal basic standard (Chapter 4 of 1992 edition; Chapter 6 of this edition);
??? Delete the 6 grades, including 1Cr18Mn10Ni5Mo3N, 1Cr18Mn12Mo2Ti,
0Cr18Ni12Mo2Ti, 1Cr18Ni5Mo12Mo3Ti, 1Cr18Ni9Ti and 0Cr26Ni5Mo2, etc. (Table 2 and Table 3 of 1992 Edition);
??? Add the 6 grades and their properties, in including 022Cr18Mn22Ni5Mo3N, 022Cr23Ni5Mo3N, 022Cr25Ni6Mo2N, 03Cr25Ni6Mo3Cu2N, 17Cr16Ni2 and
05Cr15Ni5Cu4Nb, etc. (See Table 2 and Table 7, Table 4 and Table 9, Table 5 and Table 10);
??? Adjust the chemical compositions and phosphonium content of 21 steel grades (serial numbers. 1, 3, 13, 17, 23, 25, 35, 38, 39, 41, 43, 44, 52, 55, 62, 68, 93, 85, 98, 137 and 139) based on universal international steel grade (Table 2 in 1992 Edition and Tables 1 ~ 5 in this Edition);
??? Modify the ?€?Smelting method?€? that shall apply to initial molten steel plus out-of-furnace refining process in priority (Article 5.2 of 1992 edition and Article 7.2 of this edition);
??? ?€?Delivery state?€? is changed from ?€?It may not be treated if it is required by the Buyer?€? into ?€?It may not be treated through negotiations between the Supplier and the Buyer?€?, while for precipitation-hardening stainless steel bars it has added that annealing treatment to the delivery can be chosen by steel texture (Article 5.3 of 1992 edition and Article 7.3 of this edition);
??? For ?€?Surface quality?€? it has added that ?€?It may specify to remove scales formed from heat treatment by way of pickling, turning or other methods through negotiations between the Supplier and the Buyer, which shall be indicated in contract?€? (Article 7.8.3 of this edition);
??? The heat treatment system for all kinds of stainless steel bars or test pieces is separated from mechanical property table and listed into Annex A (Informative annex) (Table 3 ~ Table 5 of 1992 edition; Table A.1 ~ Table A.5 of this edition);
??? The yield strength for martensite and precipitation-hardening stainless steel is changed to necessary inspection indicator (Article 5.4.1.1 of 1992 edition; Table 9 and Table 10 of this edition);
??? For 022Cr19Ni5Mo3Si2N(00Cr18Ni5Mo3Si2) steel, it has added that Brinell hardness value HBW shall be no more than 290 (Table 3 of 1992 edition; Table 7 of this edition); ??? For 12Cr13(1Cr13) steel it has added that the lower limit of carbon content shall be 0.08%, while its percentage elongation after fracture is adjusted from 25% to 22% (Table 2 and Table 4 of 1992 edition; Table 4 and Table 9 of this edition); ??? For 30Cr13(Y3Cr13) steel, its percentage elongation after fracture is adjusted from 12% and 40% to 8% and 35% (Table 4 of 1992 edition; Table 9 of this edition); ??? The original yield strength ??0.2 value for some martensite steels (No. 18, 22, 26, 39, 46, 50 and 52) and 06Cr13Al(0Cr13Al) is adjusted from 177Mpa to proof strength at non-proportional extension RP0.2 value to be 175 N/mm2 (Table 3 of 1992 edition; Table 6 and Table 8 of this edition);
??? The yield strength ??0.2 value for 022Cr12(00Cr12) steels is adjusted from 196MPa to proof strength at non-proportional extension RP0.2 value to be 195 N/mm2, while tensile strength is adjusted from 365MPa to 360N/mm2 (Table 3 of 1992 edition; Table 8 of this edition);
??? The tensile strengths Rm for 20Cr13 (2Cr13) and 13Cr13 (1Cr13Mo) are adjusted respectively from 635MPa and 685MPa to 640N/mm2 and 690N/mm2 (Table 4 of 1992 edition; Table 9 of this edition);
??? Delete the stipulations on section shrinkage rate of flat steel (Table 3 ~ Table 5 of 1992 edition; notes of Table 6 to Table 10 of this edition);
??? ?€?Corrosion resistance?€? is changed to an item in agreement, where it has cancelled the two test methods contained in GB/T 4334.4 and GB/T 4334.6, while for the test condition of 06Cr19Ni13Mo3 (0Cr19Ni13Mo3) it has added ?€?Sensitizing treatment?€? (Article 5.5 of 1992 edition; Article 7.5 of this edition);
??? For ?€?Surface quality?€?, add the ?€?It may specify to remove scales formed from heat treatment by way of pickling, turning or other methods through negotiations between the Supplier and the Buyer, which shall be indicated in contract?€? (Article 5.8 of 1992 edition; Article 7.8 of this edition);
??? It has clearly specified the sampling positions in ?€?Macro structure?€? and ?€?Tower shape?€? for inspection of continuous casting steel and the sampling quantity for ?€?Corrosion resistance?€? test (Article 12 of 1992 edition; Article 16 of this edition); ??? Delete the ?€?Check list for stainless steel grades of this Standard and stainless steel grades of each country?€? and changed to direct quotation of GB/T 20878. Stainless steel and heat-resisting steel ?€?Grade and chemical compositions (Annex B of 1992 edition; Table 1 ~ Table 5 of this edition).
The Annex A and Annex B of this Standard are informative.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under jurisdiction of the National Technical Committee of Standardization for Iron and Steel.
The main drafting organizations of this Standard. China Metallurgical Information and Standardization Institute, and Liaoning Dongbei Special Steel Group Co., Ltd.. The main drafters of this Standard. Luan Yan, Dai Qiang, Gu Qiang, Zeng Wentao, and Liu Baoshi.
The historical versions to be substituted by this Standard include.
-- GB/T 1220?€?1975, GB/T 1220?€?1984, GB/T 1220?€?1992.
Stainless steel bars
1. Scope
This Standard specifies the dimensions, shape, technical requirements, test methods, inspection rules, packing marks, and certificate quality of stainless steel bars (generic terms of ro...

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