The standard categorizes steel using designations based on their minimum yield strength. Common grades often include designations such as , Q890 , or Q960 , where the "Q" stands for the Chinese pinyin for yield point ( Qufu dian ), and the number represents the minimum yield strength in megapascals (MPa).
| Grade | C (max) | Si (max) | Mn | P (max) | S (max) | Cr (max) | Ni (max) | Mo (max) | B (max) | V (max) | Nb (max) | Ti (max) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Q460C | 0.20 | 0.80 | 1.00–1.60 | 0.025 | 0.015 | 1.50 | 2.00 | 0.70 | 0.005 | 0.12 | 0.06 | 0.05 | | Q460D | 0.20 | 0.80 | 1.00–1.60 | 0.025 | 0.015 | 1.50 | 2.00 | 0.70 | 0.005 | 0.12 | 0.06 | 0.05 | | Q460E | 0.20 | 0.80 | 1.00–1.60 | 0.020 | 0.010 | 1.50 | 2.00 | 0.70 | 0.005 | 0.12 | 0.06 | 0.05 | | Q690C | 0.20 | 0.80 | 1.00–1.80 | 0.025 | 0.015 | 1.50 | 2.00 | 0.70 | 0.005 | 0.12 | 0.06 | 0.05 | | Q690D | 0.20 | 0.80 | 1.00–1.80 | 0.025 | 0.015 | 1.50 | 2.00 | 0.70 | 0.005 | 0.12 | 0.06 | 0.05 | | Q690E | 0.20 | 0.80 | 1.00–1.80 | 0.020 | 0.010 | 1.50 | 2.00 | 0.70 | 0.005 | 0.12 | 0.06 | 0.05 | Source: Adapted from industry data .
GB/T 16270 is a Chinese national standard titled “高强度结构用调质钢板”, which translates to . This standard specifies the technical requirements for high-strength steel plates that undergo a quenching and tempering heat treatment process, known as "quenched and tempered" (Q+T) condition.
: Adds newer quality grades C and F for most designations to align with current industrial needs.
For high-strength steels, weldability is a primary concern. The PDF stipulates maximum limits for: gb t 16270 pdf
Steel plates produced under GB/T 16270 are used in a wide range of high-stress structural and mechanical applications. Common uses include:
. It covers plates used in heavy machinery, mining equipment (e.g., excavators, loaders, bulldozers), and structural parts of cranes. Delivery Condition : Steel must be supplied in a quenched and tempered condition (often referred to as slack quenching). Steel Grades : Common grades include Q460, Q500, Q550, Q620, Q690, Q800, Q890, and Q960 Quality Designations
The current valid version is , which replaced the original 1996 standard on April 1, 2010. GB/T 16270-1996 GB/T 16270-2009 Primary Scope Plates and strips Plates only (strips canceled) Max Thickness Up to 100mm Up to 150mm Steel Grades Q420 to Q690 Adds Q800, Q890, Q960 ; deletes Q420 Quality Grades General grades Adds C and F grades (except for Q460) Delivery State Heat-treated/Controlled rolled Quenched and Tempered (Q+T) Technical Requirements
For engineers and procurement officers, having the official is essential. Due to copyright restrictions, the official text is generally available through authorized channels. How to Find the PDF: The standard categorizes steel using designations based on
One of the most critical aspects of GB/T 16270 is the mechanical performance requirements, which guarantee the steel’s ability to withstand structural loads. The table below outlines the mechanical properties for several common grades.
Understanding the intricacies of the GB/T 16270 standard ensures that global supply chains remain synchronized, enabling safer, lighter, and more durable engineering marvels.
Steel is tested for yield strength, tensile strength, elongation, and impact energy. For example, must maintain specific impact toughness at Chinese Standard GB/T Common Steel Grades
Because of its exceptional toughness and yield strength, steel manufactured under this standard is the backbone of high-stress industrial applications. You will commonly see these plates used in: GB/T 16270 is a Chinese national standard titled
Once you have the standard, focus on these sections:
I can provide specific or mechanical property tables for that exact grade. Share public link
The standard (which replaced the older GB/T 16270-1996) defines the technical requirements for high-strength structural steel plates delivered in a quenched and tempered (Q+T) condition. Key features include:
The 2009 revision introduced tighter controls and expanded the scope, making it more aligned with modern engineering requirements. Chemical Composition and Grades
The standard explicitly states that plates shall be delivered in the condition.