Gb T 16270 Pdf [patched] May 2026

The GB/T 16270-2009 standard specifies the requirements for high-strength structural steel plates in the quenched and tempered (QT) condition. This report summarizes the key technical specifications and updates from the standard. 1. Overview of GB/T 16270-2009

Standard Name: High strength structural steel plates in the quenched and tempered condition.

Status: Valid (Implemented on 1 April 2010; superseded GB/T 16270-1996).

Scope: Covers designations, dimensions, shape, weight, technical requirements, testing methods, and quality certification.

Applicability: Specifically for steel plates with a thickness ranging from 150mm and below. 2. Key Technical Requirements

According to the English version of GB/T 16270-2009, the standard outlines several critical parameters:

Designation and Composition: Specifies chemical composition and smelting processes (typically oxygen converter or electro-smelting).

Delivery State: Steel plates must be delivered in a quenched and tempered condition.

Mechanical Properties: Includes specifications for yield strength, tensile strength, and elongation. For instance, grades like Q460C, Q550D, and Q690D have nominal yield stresses of 460 MPa, 550 MPa, and 690 MPa respectively. gb t 16270 pdf

Surface Quality: Defines acceptable limits for surface defects and required finishing. 3. Major Changes from GB/T 16270-1996

The 2009 revision introduced several significant updates to improve structural performance:

Thickness Extension: Maximum applicable thickness was increased from 100mm to 150mm.

New Steel Grades: Added high-performance grades Q800, Q890, and Q960, while deleting the Q420 grade.

Quality Grades: Introduced quality grades C and F for most steel types to provide more granular performance specifications.

Testing Adjustments: Canceled specifications for flexural property testing in favor of updated mechanical performance indexes. 4. Purchasing and Accessing the PDF

The full official text is available for purchase from standards repositories:

ChineseStandard.net: Offers the English PDF version for immediate download after payment. The GB/T 16270-2009 standard specifies the requirements for

ANSI Webstore: Provides the GB/T 16270-2009 document, though the text may be in Chinese.

Code of China: Lists detailed contents and scope for both the 1996 and 2009 versions. GB/T 16270-2009 English PDF

I’m unable to provide direct PDF files or links to copyrighted documents like GB/T 16270, but I can offer a practical guide to help you locate, understand, and use this standard effectively.

4. Mechanical Properties (The Core of the PDF)

This is the most referenced section of the standard.

A. Tensile Properties (Thickness ≤ 16mm as baseline):

| Grade | Yield Strength (MPa) Min | Tensile Strength (MPa) | Elongation (%) Min | | :--- | :--- | :--- | :--- | | Q460 | 460 | 550 - 720 | 17 | | Q500 | 500 | 590 - 770 | 17 | | Q550 | 550 | 670 - 830 | 16 | | Q620 | 620 | 710 - 880 | 15 | | Q690 | 690 | 770 - 940 | 14 |

Note: As plate thickness increases, the yield strength values decrease slightly.

B. Impact Toughness (Charpy V-Notch): This differentiates the quality grades (C, D, E). Q460D, Q460E – 460 MPa yield strength

| Quality Grade | Test Temperature | Impact Energy (Akv) Min | | :--- | :--- | :--- | | C | 0°C | 34 J (for Q690) | | D | -20°C | 34 J (for Q690) | | E | -40°C | 34 J (for Q690) |

Note: The standard requires that the steel withstand these low temperatures without becoming brittle, which is crucial for outdoor structures in cold climates.

Series 1: The Q Series (General Purpose)

Q460D, Q460E – 460 MPa yield strength. Used for crane booms and structural frames.
Q500D, Q500E – 500 MPa yield strength. Common in high-rise construction.
Q550D, Q550E – 550 MPa. The "workhorse" for mining trucks.
Q620D, Q620E – 620 MPa. For heavy lifting equipment.
Q690D, Q690E – 690 MPa. High-performance applications.
Q890D, Q890E – 890 MPa. Specialized machinery.
Q960D, Q960E – 960 MPa. Maximum strength, ultra-light designs.

3. Key technical content (summary)

Once you have the standard, focus on these sections:

| Section | Information | |---------|-------------| | Scope | Thickness range (typically 3–150 mm), application limits | | Dimension & tolerance | References to GB/T 709 | | Chemical composition | P, S limits, carbon equivalent (CEV) formulas | | Mechanical properties | Yield strength, tensile strength, elongation, impact energy (temperature & direction) | | Heat treatment | Quenching + tempering conditions | | Inspection & testing | Sampling methods, test piece location, retest rules | | Marking & cert | Steel grade, heat number, inspection certificate (3.1/3.2) |

Standard Overview: GB/T 16270

Title: High strength structural steel plates and strips Chinese Name: 高强度结构用调质钢板 Current Status: The active version is GB/T 16270-2009 (Replacing GB/T 16270-1996).

Series 2: The A/BR Series (Higher Toughness)

A550, A590, A620, A690 – These grades (often suffixed with BR, CF, or D) focus on low-temperature impact toughness (-20°C to -40°C) and bending performance.

Note: The suffix letters (D, E) denote impact test temperatures: D = -20°C, E = -40°C.

Appendix / Informative notes

Examples of designation usage, calculation examples, conversion tables, or additional guidance for test results interpretation.

If you need:

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