Gb T 16270 Pdf

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GB/T 16270 is issued by the Standardization Administration of China (SAC). It specifies the delivery conditions for high-yield strength structural steel plates. Carbon and low-alloy steels. Heat Treatment: Quenched and Tempered (Q+T).

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Which specific (e.g., Q690, Q960) you are targeting The thickness of the plate you plan to use gb t 16270 pdf

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

The table shows that as the plate thickness increases, the yield strength requirements decrease slightly due to the reduced cooling rate during quenching, which affects the steel's microstructure. All grades must pass a 180° bending test without cracking, with a specified bend diameter relative to the plate thickness .

💡 Always verify that your PDF is the most recent version, as standards are periodically updated to reflect new manufacturing technologies and safety requirements. Carbon and low-alloy steels

GB/T 16270 classifies steel based on its (measured in Megapascals, or MPa). The higher the number in the grade, the stronger the steel. Popular Steel Grades Q460: Yield strength ≥is greater than or equal to 460 MPa. Good formability. Q550: Yield strength ≥is greater than or equal to 550 MPa. Balances strength and toughness. Q690: Yield strength ≥is greater than or equal to 690 MPa. Highly popular for mobile cranes. Impact Testing Quality Degrees

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The standard governs hot-rolled structural steel plates designed to perform under high stress. The table shows that as the plate thickness

GB/T 16270-2009 is one of the most important standards for industries that rely on high-strength steel. It was formally approved on June 25, 2009, by the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) and the Standardization Administration of China (SAC), and it came into effect on April 1, 2010.

| Steel Grade | Thickness (mm) | Yield Strength (min, MPa) | Tensile Strength (MPa) | Elongation (min, %) | Impact Toughness (J) | | :--- | :--- | :--- | :--- | :--- | :--- | | Q460C | ≤50 | 460 | 550–720 | 17 | 40 (0°C) | | Q460C | 50–100 | 440 | 500–670 | 17 | 40 (0°C) | | Q460D | ≤50 | 460 | 550–720 | 17 | 40 (-20°C) | | Q460E | ≤50 | 460 | 550–720 | 17 | 40 (-40°C) | | Q690C | ≤50 | 690 | 770–940 | 14 | 40 (0°C) | | Q690D | ≤50 | 690 | 770–940 | 14 | 40 (-20°C) | | Q690E | ≤50 | 690 | 770–940 | 14 | 40 (-40°C) | Source: Adapted from industry data .

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Standards are updated periodically to adapt to modern metallurgical technologies. Ensure you are reviewing the most current active version of the document (e.g., confirming whether subsequent updates or amendments have superseded older editions).

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