GB/T 3524-2015Hot-rolled carbon and low alloy structural steel strips (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 3524-2005 Hot-rolled carbon and low alloy structural steel strips.

Compared with GB/T 3524-2005, The main technical changes are as follows.

- Expanded the range of steel strip specifications;

- Adjusted the tolerance of steel strip thickness;

- Adjusted the tolerance of steel strip width;

- Strengthened the allowable deviation of three-points difference of steel strip;

- Refined the allowable deviation of same-strip difference of steel strip;

- Adjusted sampling requirements for steel strip;

- Deleted two designations. Q255, Q295;

- Added three designations. Q390, Q420, Q460.

1 Scope

This Standard specified the classification and code, ordering content, size, shape, weight and tolerance, technical requirements, test methods, inspection rules, packaging, marks and quality certification, etc. of hot-rolled carbon and low alloy structural steel strips.

This Standard applies to hot-rolled carbon and low alloy structural steel strips of which thickness is not greater than 12.00 mm, the width is not greater than 600 mm (hereinafter referred to as "steel strips").

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) 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 223.9 Methods for chemical analysis of iron, steel and alloy - The chrom azurol S photometric method for the determination of aluminium content

3 Classification and code

4 Ordering content

4.1 Order contract shall contain the following information.

4.2 If the contract does not specify the edge state, thickness precision, delivery status, the steel strips shall be delivered as un-trimming, ordinary thickness precision, hot-rolled state.

5 Size, shape, weight and tolerance

6 Technical requirements

7 Test methods

8 Inspection rules

8.1 The steel strip inspection and acceptance shall be performed by the technical quality supervision department of seller.

8.2 Steel strips shall be inspected and accepted in batch. A batch is composed by steel strips of same designation, same furnace number, same specification and same delivery status.

9 Packaging, marks and quality certificate

The packaging, marks and quality certificate of steel strips shall comply with provisions of GB/T 247.

10 Rounding of numerical value

This Standard uses rounding value comparison method. The rounding rules shall comply with provisions of GB/T 8170. […]