GB/T 1220-2007 PDF English
US$125.00 · In stock · Download in 9 secondsGB/T 1220-2007: Stainless steel rod Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 1220: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 1220-2007 | English | 125 |
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Stainless steel rod
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| GB/T 1220-1992 | English | 919 |
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Stainless steel bars
| Obsolete |
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GB/T 1220-2007: Stainless steel rod---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT1220-2007
GB
ICS 77.140.20
H 40
NATIONAL STANDARD
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’s Republic of China;
Standardization Administration of the People’s 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
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
round steel, square steel, flat steel, hexagonal steel and octagonal steel, hereinafter refer to as
“Steel bar”).
This Standard is applicable to the hot rolled and forged steel bars of which the dimension
(diameter, side length, thickness or subtense distance, hereinafter refer to as “Dimension”) 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.
2.Normative References
The articles contained in the following documents have become part of this Standard when
they are quoted herein. For the dated documents so quoted, all the modifications (excluding
corrections) or revisions made thereafter shall not be applicable to this Standard. For the
undated documents so quoted, the latest editions shall be applicable to this Standard.
GB/T 222 Permissible deviations for chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The Diantipyrylmethane
Phosphomolybdate Gravimetric Method for the Determination of phosphonium content
GB/T 223.4 Methods for chemical analysis of iron, steel and alloy - The volumetric method
for determination of manganese content by ammonium nitrate oxidation
GB/T 223.5 Methods for chemical analysis of iron, steel and alloy – The reduction type
silicomolybdic acid spectrophotometric method for the determination of acid-soluble silicon
content
GB/T 223.8 Methods for chemical analysis of iron, steel and alloy –The sodium fluoride
separation-EDTA titration method for the determination of aluminium content
3.Terms and definitions
The technical terms and definitions established in GB/T 20878 and GB/T 15574 are
applicable to this Standard.
4.Contents in order sheet
The contract for goods or order form made according this Standard shall contain the following contents.
5.Classification
5.1 By structural features, steel bars are divided into 5 categories - austenite type,
austenite-ferrite type, ferrite type, martensite type, and precipitation-hardening type.
5.2 By application methods, steel bars are divided into 2 categories as follows.
6.Dimension, shape, weight and permissible deviation
6.1 Dimension, shape, weight and permissible deviation of hot-rolled round steel and square steel
The dimension, shape, weight and permissible deviation of hot-rolled round steel and square
steel shall conform to the stipulations set forth in GB/T 702-2004, the concrete requirements
of which shall be indicated in contract. Otherwise it shall execute the second group
contained in GB/T 802-2004 Standard.
6.2 Dimension, shape, weight and permissible deviation of hot-rolled flat steel
The dimension, shape, weight and permissible deviation of hot-rolled flat steel shall
conform to the stipulations set forth in GB/T 704-1988, the concrete requirements of which
shall be indicated in contract. Otherwise it shall execute the contract according to the
common class as specified in GB/T 704-1998.
6.3 Dimension, shape, weight and permissible deviation of hot-rolled hexagonal steel and
octagonal steel
The dimension, shape, weight and permissible deviation of hot-rolled hexagonal steel and
octagonal steel shall conform to the stipulations set forth in GB/T 705-1985, the concrete
requirements of which shall be indicated in contract. Otherwise it shall execute the contract
according to the second group as specified in GB/T 705-1985.
6.5 Dimension, shape, weight and permissible deviation of forged flat steel
The dimension, shape, weight and permissible deviation of forged flat steel shall conform to
the stipulations set forth in GB/T 16761-1997, the concrete requirements of which shall be
indicated in contract. Otherwise it shall execute the contract according to the second group
as specified in GB/T 16761-1997.
6.6 Weight
Steel bars shall be delivered by actual weight.
7.Technical requirements
7.1 Grade and chemical components
7.2 Melting method
Unless it is otherwise stipulated in contract, it shall usually adopt initial molten steel plus
out-of-furnace refining process.
7.3 Delivery state
Steel bars can be delivered in heat-treated or non-heat-treated state and the order can select
delivery state with reference to Articles 7.3.1 ~ 7.3.4, which shall be indicated in contract.
Otherwise, it shall deliver non-heat-treated steels. The regulations for heat treatment of all
kinds of steel bars refer to Table A.1 ~ Table A.5 in Annex A.
7.4 Mechanical properties
7.4.1 The heat treatment regulations for all kinds of steel bars of test pieces shall refer to the
stipulations set forth in Table A.1 ~ Table A.5 of Annex A. The dimension of test piece
blank for heat treatment shall usually be 25mm. When the dimension of steel bar is less
than 25mm, heat treatment shall be conducted on original dimension steel bars.
7.4.4 The mechanical properties of precipitation-hardening type steel bars shall be indicated in
contract, otherwise it shall execute the second group in contract.
7.4.5 If the Supplier can guarantee the qualification of mechanical properties, it may wholly or
partially omit mechanical property test.
7.6 Macro structure
7.7 Hot forging
7.7.1 Steel for hot heading upsetting (to be indicated in contract) shall be subject to hot forging
test to forge test piece to one third of the original height without crack or breach on the
surface.
7.7.2 This test can be omitted for steel bar with dimension to be more than 80mm if the
Supplier can guarantee the qualification of forging test.
7.8 Surface quality
7.8.1 The surface of steel bars for pressing processing shall have no crack, scab, fold or
inclusion on surface, otherwise, the defects mentioned above must be eliminated.
7.8.2 It is permissible for steel bars for cutting processing to have local defects no more than
stipulations counting from nominal dimension as set forth in Table 15.
7.8.3 It can remove the scale produced by heat treatment by pickling, turning or other methods
through negotiations of both the Supplier and Buyer, which shall be indicated in contract.
7.9 Special requirements
Steel bars can be supplied by the following special requirements as requested by the Buyer
and with agreement reached by both the Supplier and Buyer.
8.Test methods
The inspection items and test methods for each lot of steel bars shall conform to the
stipulations as set forth in Table 16.
9.Inspection rules
9.1 Inspection and acceptance
The inspection and acceptance of steel bars shall be conducted by the technical and quality
control departments of the Supplier.
9.2 Lot organization rules
The inspection and acceptance of steel bars shall be carried out lot by lot. Each lot shall be
composed of steel bars of the same grade, same furnace number, same processing method,
same dimension and same delivery state (same furnace number of heat treatment).
9.3 Sampling position and sampling quantity
The sampling position and sampling quantity for each lot of steel bars shall conform to the
stipulations set forth in Table 16.
9.4 Rules for re-inspection and determination
10.Packing, marking and quality certificate
The packing, marking and quality certificate shall conform to the stipulations of GB/T 2101.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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