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chemical composition | ||||||||||||||||||
Grade | C | Si | Mn | P | S | Cr | Ni | Mo | T | |||||||||
≤ | ||||||||||||||||||
NM300 | 0.23 | 0.70 | 1.60 | 0.025 | 0.015 | 0.70 | 0.50 | 0.40 | 0.050 | |||||||||
NM360 | 0.25 | 0.70 | 1.60 | 0.025 | 0.015 | 0.80 | 0.50 | 0.50 | 0.050 | |||||||||
NM400 | 0.30 | 0.70 | 1.60 | 0.025 | 0.010 | 1.0 | 0.70 | 0.50 | 0.050 | |||||||||
NM450 | 0.35 | 0.70 | 1.70 | 0.025 | 0.010 | 1.1 | 0.80 | 0.55 | 0.050 | |||||||||
NM500 | 0.38 | 0.70 | 1.70 | 0.020 | 0.010 | 1.2 | 1.00 | 0.65 | 0.050 | |||||||||
Mechanical property | ||||||||
Grade | Thickness(mm) | tensile strength(MPa) | Elongation A(%) | Surface Brinell hardness(HBW) | ||||
NM300 | ≤80 | ≥1000 | ≥14 | 270-330 | ||||
NM360 | ≤80 | ≥1100 | ≥12 | 330-390 | ||||
NM400 | ≤80 | ≥1200 | ≥10 | 370-430 | ||||
NM450 | ≤80 | ≥1250 | ≥7 | 420-480 | ||||
NM500 | ≤70 | - | - | ≥470 | ||||
CHINA GRADE | CHINA STANDARD | EQUAL GRDAE | ||
JFE | SSAB | |||
NM300 | GB/T 24186-2009 | EH300 | HARDOX300 | |
NM360 | GB/T 24186-2009 | EH360 | HARDOX360 | |
NM400 | GB/T 24186-2009 | EH400 | HARDOX400 | |
NM450 | GB/T 24186-2009 | EH450 | HARDOX450 | |
NM500 | GB/T 24186-2009 | EH500 | HARDOX500 | |
NM550 | GB/T 24186-2009 | EH500 | HARDOX550 | |
NM600 | GB/T 24186-2009 | EH500 | HARDOX600 | |








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