GB/T 3274-2007 in English

《GB/T 3274-2007碳素结构钢和低合金结构钢热轧厚钢板和钢带》由TC183（全国钢标准化技术委员会）归口，主管部门为中国钢铁工业协会。
本标准规定了碳素结构钢和低合金结构钢热轧厚钢板钢带的订货内容、尺寸、外形、重量及允许偏差、技术要求、试验方法、检验规则、包装、标志和质量证明书。 本标准适用于厚度3mm~400mm碳素结构钢和低合金结构钢热轧厚钢板和厚度为3mm~25.4mm的热轧钢带。

1 ScopeThe standard specifies the content, size, form, weight, permissible tolerance, technical conditions, experiment, checking rules, packaging, label and quality certification of hot-rolled steel plate and strip of carbon structural steel and low-alloy structural steel
This standard is applicable to 3mm- 400mm thick hot-rolled steel plate or 3mm- 245mm thick hot-rolled steel strip of carbon structural steel and low-alloy structural steel.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. As for dated reference, subsequent amendments (excluding amend error) to, or revisions of, any of these publications do not apply. 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 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy - the Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination of Phosphorus Content
GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy - the Reduced Molybdosilicate Spectrophotometric Method for the Determination of Acid-soluble Silicon Content
GB/T 223.10 Methods for Chemical Analysis of Iron, steel and Alloy - the Cupferron Separation-chrome Azurol S Phot
GB/T 223.11 Methods for Chemical Analysis of Iron, Steel and Alloy - the Ammonium Persulfate Oxidation Volumetric
GB/T 223.14 Methods for Chemical Analysis of Iron, steel and Alloy - the N-benzoyl-n-phenylhydroxylamine Extractio
GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy - the Diantipyrylmethane Photometric Method for the Determination of Titanium Content
GB/T 223.18 Methods for Chemical Analysis of Iron Steel and Alloy - the Sodium Thiosulfate Separation Iodimetric Method for the Determination of Cupper Content
GB/T 223.19 Methods for Chemical Analysis of Iron, Steel and Alloy-the Neocuproine-chloroform Extraction Photometric Method for the Determination of Copper Content
GB/T 223.23 Methods for Chemical Analysis of Iron, Steel and Alloy- the Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content
GB/T 223.24 Methods for Chemical Analysisof Iron, steel and Alloy - the Extraction Separation--the Dimethylglyoxime Spectrophotometric Method for The Determination of Nickel Content
GB/T 223.32 Methods for Chemical Analysis of Iron, Steel and Alloy - the Hypophosphite Reduction-iodimetric Method for the Determination of Arsenic Content
GB/T 223.37 Methods for Chemical Analysis of Iron, steel and Alloy - the Indophenol Blue Photometric Methods for the Determination of Nitrogen Content after Distillation Separation
GB/T 223.40 Methods for Chemical Analysis of Iron, steel and Alloy - the Anion-exchange Separation-sulphochlorophenol S Photometric Method for the Determination of Niobium Content
GB/T 223.58 Methods for Chemical Analysis of Iron, steel and Alloy--the Sodium Arsenite-sodium Nitrite Titrimetric Method for the Determination of Manganese Content
GB/T 223.59 Methods for Chemical Analysis of Iron, steel and Alloy--the Reduced Molybdoantimonyl Phosphoric Acid Photometric Method for the Determination of Phosphorus Content
GB/T 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy--the Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon Content
GB/T 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy--the Sodium (potassium) Periodate Photometric Method for the Determination of Manganese Content
GB/T 223.64 Methods for Chemical Analysis of Iron, Steel and Alloy--the Flame Atomic Absorption Spectrometric Method for the Determination of Manganese Content
GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy-the Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the Determination of Sulfur Content
GB/T 223.71 Methods for Chemical Analysis of Iron, Steel and Alloy-the Gravimetric Method after Combustion in the Pipe Furnace for the Determination of Carbon Content
GB/T 223.72 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 228 Points of the Testing Method Used for Metal Materials in Compression at Ambient Temperature (GB/T 228-2002, eqv ISO 6892: 1998)
GB/T 229 Metallic Materials-charpy Notch Impact Test (GB/T 229-1994, eqv ISO 83: 1976, eqv ISO 148: 1983)GB/T 232 Metallic Materials--Bend Test (GB/T 232-1999, eqv ISO 7438:1985)
GB/T 247 General Rule of Acceptance, Package, Mark and Certification for Steel Plates (sheets) and Strips
GB/T 700 Carbon Structural Steels
GB/T 709 Dimensions, Shape, Weight and Tolerances for Hot-rolled Plates and Sheets
GB/T 1591 High Strength Low Alloy Structural Steels
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing (GB/T 2975-1998, eqv ISO377; 1997)
GB/T 4336 Method for Photoelectric Emission Spectroscopic Analysis of Carbon Steel Medium and Low Alloy Steel (Routine method)
GB/T 14977 General Requirement of Surface Finish for Hot Rolled Steel Plates
GB/T 17505 Steel and Steel Products General Technical Delivery Requirements (GB/T 17050-1998, eqv ISO 404; 1992)GB/T 18253 Steel and Steel Products-types of Inspection Documents GB/T 18253-2000, eqv ISO 10474; 1991)
GB/T 20066 Steel and Iron/Sampling and Preparation of Samples for t he Determination of Chemical Composition (GB/T 20066-2006, eqv ISO 14284; 1996, IDT)
YB/T 081 Rule for Rounding-off of Numerical Values and Judgment of Testing Values for Technical Standards of Metallurgy

3 Purchasing Content
3.1 According to this standard, purchasing contract or order shall include the following items:
a) Standard No;
b) Product name (single-rolled steel plate, continuously rolled plate and steel strip);
c) Label;
d) Size;
e) Rim condition (trimming EC, non-trimming EM;
f) Categories of Permissible thickness tolerance of single-rolled steel plate (N, A, B and C);
g) Thickness accuracy of steel strip and continuously rolled steel plate (PT.A and PT.B);
h) Weight;
I) Delivery condition;
J) Usage;
K) Special requirements;
3.2 If there are no clear specifications for items from e) to g) in the purchasing contract, then the following provisions shall be abided by:
a) The single rolled steel plate usually will be delivered with trimming four edges; while the steel strip will be delivered with non-trimming; the steel plate sheared by steel strip will be delivered with trimming edges; the steel strip applies non-trimming delivery, while the steel plate sheared by steel strip applies trimming delivery;
b) The permissible thickness tolerance of single-rolled steel plate applies symmetrical tolerance (N category)
c) The thickness accuracy of steel strip and/or continuously rolled steel plate applies to general accuracy (PT.A category);