Gb T 16270 Pdf May 2026
GB/T 16270 is the Chinese national standard for high-strength structural steel plates delivered in a quenched and tempered condition. The current active version is GB/T 16270-2009, which replaced the older 1996 version. Key Features and Specifications
The standard governs the technical delivery conditions for steel plates with a thickness of up to 150mm. Primary features include:
Designation System: Steel grades are named using three parts: the letter "Q" (representing yield strength), a numerical value for the minimum yield strength (e.g., 460, 690, 960), and a quality grade (C, D, E, or F).
Broad Grade Range: Includes standard grades like Q460, Q500, Q550, Q620, and Q690, as well as ultra-high-strength grades such as Q800, Q890, and Q960. gb t 16270 pdf
Delivery Condition: Specifically applies to plates in the quenched and tempered (Q+T) state, which provides a balance of high strength and good toughness.
Technical Requirements: Specifies strict limits for chemical composition, mechanical properties (yield/tensile strength, elongation), and impact toughness at specific temperatures (e.g., Q690E requires impact testing at -40°C).
Surface Quality: Mandates that plates must be free of flaws like bubbles, scabs, and lamination. Common Applications GB/T 16270 is the Chinese national standard for
Due to its high strength-to-weight ratio and fatigue resistance, steel complying with GB/T 16270 is widely used in: Detail of GB/T 16270-2009 - Code of China
3. Technical Requirements (Chemical Composition)
The steel is typically delivered in the Quenched and Tempered (Q&T) condition (known as "Tiao Zhi" in Chinese), which provides high strength through heat treatment.
Melting Analysis (Typical Limits %): The standard restricts elements to ensure weldability. While specific limits vary by grade, the general trends are: ⚠️ Avoid random “free PDF” sites — they
| Element | Typical Limit (Max %) | Purpose | | :--- | :--- | :--- | | Carbon (C) | 0.12% – 0.20% | Lower carbon improves weldability. | | Silicon (Si) | 0.60% | Deoxidizer. | | Manganese (Mn) | 1.00% – 1.70% | Strengthens ferrite. | | Phosphorus (P) | 0.025% (for Grade E) | Impurity restricted for toughness. | | Sulfur (S) | 0.015% (for Grade E) | Impurity restricted to prevent cracking. |
Note: Higher grades (Q690) often require micro-alloying elements like Nb (Niobium), V (Vanadium), Ti (Titanium), and sometimes Cr (Chromium) or Mo (Molybdenum).
2. How to legally obtain the PDF
| Source | Method | |--------|--------| | Chinese National Standard (SAC/CNIS) | Official paid download via openstd.samr.gov.cn (Chinese interface) | | China Standard Bookstore | English & Chinese versions; purchase PDF | | ANSI Webstore / IHS Markit | International resellers; fee applies | | University/Institution library | Some have access to Chinese standards databases (e.g., Wanfang, CNKI) |
⚠️ Avoid random “free PDF” sites — they often contain outdated or incorrect versions.
Heat treatment and delivery condition
- Delivery conditions: Normalized, quenched and tempered, annealed, normalized and tempered, as-rolled, etc.
- Heat treatment requirements and allowed temperature ranges.