Valid

GB/T 32977-2016Hot rolled improved corrosion resisting steel sections (English PDF)

改善耐蚀性能热轧型钢

Preview PDF

This is a limited preview

Buy now to download the full PDF (15 pages)

Need quotation for your management?

Get a formal quotation for GB/T 32977-2016 in 30 minutes.

Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2016

Implementation date

July 1, 2017

Scope

GB/T 32977-2016 is the English-translated version of 改善耐蚀性能热轧型钢.

GB/T 32977-2016 is the Chinese standard "Hot Rolled Improved Corrosion Resisting Steel Sections".

Its scope clause reads: This Standard specifies the order content, designation system, dimensions, shape, weight and tolerances, technical requirements, test method, inspection rules, packaging, marking and quality certification of hot rolled improved corrosion resisting steel sections (including I sections, channel steel, hot rolled equal-leg angle steel, hot rolled unequal-leg angle steel and hot rolled H sections).

This Standard applies to hot rolled improved corrosion resisting steel sections (hereinafter referred to as steel sections). Its clauses include order content; designation system; dimensions, shape, weight and tolerances; technical requirements; test method; inspection rules; packaging, marking and quality certification.

It was issued by the General Administration of Quality Supervision, Inspection and Quarantine on AUGUST 29, 2016 and took effect on JULY 1, 2017.

Found what you need?

Document preview — GB/T 32977-2016

National Standard of the People's Republic of China

ICS: 77.140.70
Classification: H 40

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative References4
3 Order Content6
4 Designation System6
5 Dimensions, Shape, Weight and Tolerances6
6 Technical Requirements7
7 Test Method8
8 Inspection Rules9
9 Packaging, Marking and Quality Certification10
Annex A (Normative) Test Method of Corrosion Resistance for Steel Sections11

Foreword

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

1 Scope

This Standard specifies the order content, designation system, dimensions, shape, weight and tolerances, technical requirements, test method, inspection rules, packaging, marking and quality certification of hot rolled improved corrosion resisting steel sections (including I sections, channel steel, hot rolled equal-leg angle steel, hot rolled unequal-leg angle steel and hot rolled H sections).

This Standard applies to hot rolled improved corrosion resisting steel sections (hereinafter referred to as steel sections).

2 Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced document (including any amendments) applies to this Standard.

GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products

GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and Total Silicon Content - Reduced Molybdosilicate Spectrophotometric Method

GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method

GB/T 223.12 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Carbonate Separation-Diphenyl Carbazide Photometric Method for the Determination Of Chromium 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 Iron, Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method

GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate Spectrophotometric Method

GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method

GB/T 223.49 Methods for Chemical Analysis of Iron, Steel and Alloy Extraction Separation-Chlorophosphonazo mA Spectrophotometric Method for the Determination of the Total Rare Earth Content

GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Copper Content

GB/T 223.54 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Nickel Content

GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method

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 223.68 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 223.69 Iron, Steel and Alloy - Determination of Carbon Content - Gas-volumetric Method after Combustion in the Pipe Furnace

GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature

GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method

GB/T 232 Metallic Materials - Bend Test

GB/T 700 Carbon Structural Steels

GB/T 1266 Chemical Reagent - Sodium Chloride

GB/T 1591 High Strength Low Alloy Structural Steels

GB/T 2101 General Requirement of Acceptance, Packaging, Marking and Certification for Section Steel

GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing

GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method)

GB/T 11263 Hot-rolled H and Cut T Section Steel elements may be added, such as Nb, V, Ti and Al.

6 Technical Requirements

6.1.3 In order to improve the corrosion resistance performance of steel sections, one or more alloying elements may be added. Mo <= 0.3 0%, RE <= 0.0 5% and so on.

6.1.4 The content of the residual elements Cu in steel shall not be more than 0.30%.

6.1.5 The tolerances of the chemical compositions of finished steel sections shall meet the specifications of GB/T 222.

6.2 Mechanical property and technological property

The mechanical property and technological property of steel sections shall meet the specifications of corresponding strength grades of GB/T 700 and GB/T 1591.

6.3 Delivery state

Steel sections shall be delivered in the state of hot rolling or controlled rolling.

6.4 Surface finish

6.4.1 The surface of steel section shall be free from cracks, overlays, scars, layers and inclusions.

6.4.2 The defects are allowed on the surface, such as local crazes, pits, indentations, scratches and scale impressions, but they shall not exceed the tolerances of the dimensions of steel sections.

6.4.3 It is allowed to remove the defects on the surface of steel sections. The defect removal spots shall be smooth without corners. The width of removal shall not be less than 5 times of the depth of removal. The dimensions of steel sections after removal shall not exceed the tolerances of dimensions.

6.4.4 The ends of steel section shall be free from burrs more than 5 mm.

6.5 Corrosion resistance

The corrosion resistance of steel sections shall be compared with the designation Q235 in GB/T 700 in accordance with the evaluation method in Annex A; the relative corrosion rate shall be lower than 60%. The relative corrosion rate of steel sections is calculated in accordance with Formula (1).

Relative corrosion rate = (average corrosion rate of corrosion resisting steel ÷ average corrosion rate of Q235) × 100%... (1)

7 Test Method

7.1 The test items, sampling quantity and test method for each batch of steel shall

A.3.3.2 Preparation of solution. Use 20 g of analytically pure sodium chloride conforming to GB/T 1266 to dissolve in 980 mL of deionized water or distilled water of conductivity not exceeding 20 µS·cm-1 under room temperature. The pH value of this solution is within the range 6.5 to 7.5. A.3.3.3 Replenisher. Deionized or distilled water.

A.3.3.4

The determination of chloride concentration. as required by GB/T 11896

A.4 Test method

A.4.1 Clean the surface of the test pieces before the test; remove burrs and debris from the holes; and wash them. During washing, first use gasoline or petroleum ether, then use absolute ethyl alcohol, and then use acetone. Use hot air to dry them after washing.

A.4.2 Measure and record the original weight (accurate to 1 mg), external dimensions (accurate to 0.1 mm) and surface roughness and other aspects of the test pieces.

A.4.3 The test pieces shall be suspended with non-woven materials; the height of suspension shall be maintained consistent; and the position of the test pieces shall be recorded. When suspended with a plastic insulated conductor, attention shall be paid to prevent the metal wire core from contacting the solution or test pieces.

A.4.4 Pour a newly-prepared test solution into a tank to a prescribed scale. the total quantity is (10.0 ± 0.5) L. Close the door of the chamber and start up the equipment. […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223.53

Similar standards

GB/T 47634-2026|GB/T 47885-2026|GB/T 47996-2026|GB/T 706-2026|GB/T 8602-2026|GB/T 11264-2025

How to Download GB/T 32977-2016

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.