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The alloy steel with the total amount of alloy elements less than 5% is called low alloy steel. The allowable stress of low-alloy high-strength steel is 1.4 times higher than that of carbon structural steel. Compared with carbon structural steel, the use of low-alloy high-strength steel can reduce the size and weight of structural members. It must be noted that the allowable stress of members that may bend must be corrected to ensure the robustness of the structure. Sometimes, low-alloy high-strength steel is used to replace carbon structural steel without changing the section size. The only purpose is to obtain a structure with higher strength and durability without increasing the weight. Saving weight is the most important for the structure of transport vehicles, so that heavier weight can be transported and energy consumption can be reduced.
Typical Composition (wt. %) of Cold Rolled, Micro-alloyed High-Strength Low-Alloy Variants：
Chemical composition | C | Si | Mn | P | S | Al | Ti | Nb | Cu | ||
WSS-M1A367-A33 CR240LA | ≤ 0.10 | ≤ 0.50 | ≤ 1.00 | ≤ 0.030 | ≤ 0.025 | ≥ 0.015 | ≤ 0.15 | ≤ 0.09 | ≤ 0.20 | ||
WSS-M1A367-A34 CR270LA | ≤ 0.12 | ≤ 0.50 | ≤ 1.00 | ≤ 0.030 | ≤ 0.025 | ≥ 0.015 | ≤ 0.15 | ≤ 0.09 | ≤ 0.20 | ||
WSS-M1A367-A35 CR300LA | ≤ 0.12 | ≤ 0.50 | ≤ 1.40 | ≤ 0.030 | ≤ 0.025 | ≥ 0.015 | ≤ 0.15 | ≤ 0.09 | ≤ 0.20 | ||
WSS-M1A367-A36 CR340LA | ≤ 0.12 | ≤ 0.50 | ≤ 1.50 | ≤ 0.030 | ≤ 0.025 | ≥ 0.015 | ≤ 0.15 | ≤ 0.09 | ≤ 0.20 | ||
WSS-M1A367-A37 CR380LA | ≤ 0.12 | ≤ 0.50 | ≤ 1.60 | ≤ 0.030 | ≤ 0.025 | ≥ 0.015 | ≤ 0.15 | ≤ 0.09 | ≤ 0.20 | ||
WSS-M1A367-A38 CR420LA | ≤ 0.12 | ≤ 0.50 | ≤ 1.65 | ≤ 0.030 | ≤ 0.025 | ≥ 0.015 | ≤ 0.15 | ≤ 0.09 | ≤ 0.20 | ||
WSS-M1A367-A39 CR500LA | ≤ 0.13 | ≤ 0.60 | ≤ 1.70 | ≤ 0.030 | ≤ 0.025 | ≥ 0.015 | ≤ 0.15 | ≤ 0.10 | ≤ 0.20 | ||
Mechanical Properties for Typically Cold Rolled, Micro-alloyed High-Strength Low-Alloy Variants：
The material | YS,MPA(min) | YS,MPA(max) | TS, MPa (min) | TS, MPa (max) | ||||||
WSS-M1A367-A33 CR240LA | 240 | 320 | 320 | 430 | ||||||
WSS-M1A367-A34 CR270LA | 270 | 350 | 330 | 460 | ||||||
WSS-M1A367-A35 CR300LA | 300 | 380 | 370 | 490 | ||||||
WSS-M1A367-A36 CR340LA | 340 | 420 | 410 | 530 | ||||||
WSS-M1A367-A37 CR380LA | 380 | 460 | 450 | 570 | ||||||
WSS-M1A367-A38 CR420LA | 420 | 520 | 480 | 600 | ||||||
WSS-M1A367-A39 CR500LA | 500 | 600 | 560 | 700 | ||||||
The material | ASTM Total Elongation, % (min) | EN Total Elongation, % (min) | JIS Total Elongation, % (min) | n value (min) | ||||||||||
WSS-M1A367-A33 CR240LA | 28 | 26 | 32 | 0.15 | ||||||||||
WSS-M1A367-A34 CR270LA | 26 | 24 | 30 | 0.15 | ||||||||||
WSS-M1A367-A35 CR300LA | 24 | 22 | 28 | 0.14 | ||||||||||
WSS-M1A367-A36 CR340LA | 22 | 20 | 26 | 0.13 | ||||||||||
WSS-M1A367-A37 CR380LA | 20 | 18 | 24 | 0.12 | ||||||||||
WSS-M1A367-A38 CR420LA | 18 | 16 | 22 | 0.11 | ||||||||||
WSS-M1A367-A39 CR500LA | 16 | 14 | 20 | 0.09 | ||||||||||