Q420 is a kind of low alloy high strength structural steel, the implementation standard is GB1591-2008. Q-the first letter of the Chinese pinyin of the word "qu" in the yield strength of steel; 420-the yield strength value, in MPa; C-the quality grade is C (grades are divided into A, B, C, D, and E).
Q420 high strength low alloy steel chemical composition
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Chemical Composition % (GB/T 1591 – 2008) |
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|
Steel Grade |
Grade |
C (≤) |
Si (≤) |
Mn (≤) |
P (≤) |
S (≤) |
Nb (≤) |
V (≤) |
Ti (≤) |
Cr (≤) |
Ni (≤) |
Cu (≤) |
N (≤) |
Mo (≤) |
B (≤) |
Als (≥) |
|
Q420 |
Q420A |
0.20 |
0.50 |
1.70 |
0.035 |
0.035 |
0.07 |
0.20 |
0.20 |
0.30 |
0.80 |
0.30 |
0.015 |
0.20 |
– |
– |
|
Q420B |
0.035 |
0.035 |
– |
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|
Q420C |
0.030 |
0.030 |
0.015 |
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|
Q420D |
0.030 |
0.025 |
0.015 |
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|
Q420E |
0.025 |
0.020 |
0.015 |
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Q420 high strength low alloy hsla steel mechanical property
|
Thickness or Dia. (Ø) mm; Yield Strength (≥N/mm2) |
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|
Steel Grade |
Quality |
Ø≤16 |
16< Ø ≤40 |
40 < Ø ≤63 |
63 < Ø ≤ 80 |
80 < Ø ≤ 100 |
100 < Ø ≤ 150 |
150 < Ø ≤ 200 |
200 < Ø ≤ 250 |
250 < Ø ≤ 400 |
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|
Q420 |
Q420B |
420 |
410 |
390 |
370 |
370 |
350 |
– |
– |
– |
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|
Q420C |
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|
Dia. (Ø) mm; Tensile Strength (N/mm2) |
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|
Steel Grade |
Quality Level |
Ø≤100 |
100 < Ø ≤ 150 |
150 < Ø ≤ 250 |
250 < Ø ≤ 400 |
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|
Q420 |
Q420B |
520 – 680 |
500 – 650 |
– |
– |
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|
Q420C |
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Q420 has high strength, good fatigue resistance; high toughness and low brittle transition temperature; good cold forming performance and welding performance; good corrosion resistance and certain wear resistance. It has high strength, especially in the normalizing or normalizing and tempering state, and has high comprehensive mechanical properties.
Commonly used in large ships, bridges, power station equipment, medium and high pressure boilers, high pressure vessels, rolling stock, overweight machinery, mining machinery, and other large welded structural parts.
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