GB/T 16270 Q460D is a high-strength low-alloy structural steel plate produced under the Chinese national standard GB/T 16270. It is a quenched and tempered (Q+T) steel grade, designed to deliver high yield strength, excellent toughness, and superior weldability, making it ideal for heavy-duty structural and engineering applications.
Chemical requirement
|
Grade |
Chemical requirement or element Max % |
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|
|
C |
Si |
Mn |
P |
S |
Cu |
Cr |
Ni |
Mo |
B |
V |
Nb |
Ti |
|
|
Q460D |
0.2 |
0.8 |
1.70 |
0.025 |
0.015 |
0.5 |
1.5 |
2.0 |
0.7 |
0.005 |
0.12 |
0.06 |
0.05 |
|
Q460D Property in tensile and yield strength, and impact test requirement
|
Grade |
Property |
Impact test |
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|
Q460D |
Yield Mpa Min |
Tensile Mpa |
Elongation |
Min J |
|||||||
|
Thickness mm |
Thickness mm |
Degree |
|||||||||
|
50 |
50-100 |
100-150 |
50 |
50-100 |
10-150 |
% |
0 |
-20 |
-40 |
-60 |
|
|
460 |
440 |
400 |
550-720 |
500-670 |
17 |
|
47 |
|
|
||
Heat Treatment Process
The plate undergoes quenching and tempering (Q+T) treatment:
Quenching: Rapid cooling from austenitizing temperature (~900°C) to form martensite, increasing hardness and strength.
Tempering: Reheating to ~600°C to improve ductility, relieve internal stresses, and enhance toughness.
This controlled process ensures a balanced combination of strength, toughness, and weldability, suitable for high-performance structural use.
