0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30
(2)GB标准优质碳素钢 （GB699-88）
GB 08F 0.05-0.11 ≤0.03 0.25-0.50 0.035 0.035 ≤0.10 ≤0.25 GB 10F 0.07-0.14 ≤0.07 0.25-0.50 0.035 0.035 ≤0.15 ≤0.25 GB 15F 0.12-0.19 ≤0.07 0.25-0.50 0.035 0.035 ≤0.25 ≤0.25 GB 08 0.05-0.12 0.17-0.37 0.35-0.65 0.035 0.035 ≤0.10 ≤0.25 GB 08AL 0.05-0.12 ≤0.03 0.25-0.65 0.035 0.035 ≤0.10 ≤0.25 GB 10 0.07-0.14 0.17-0.37 0.35-0.65 0.035 0.035 ≤0.15 ≤0.25 GB 15 0.12-0.19 0.17-0.37 0.35-0.65 0.035 0.035 ≤0.25 ≤0.25 GB 20 0.17-0.24 0.17-0.37 0.35-0.65 0.035 0.035 ≤0.25 ≤0.25 GB 25 0.22-0.30 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25 GB 30 0.27-0.35 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25 GB 35 0.32-0.40 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25 GB 40 0.37-0.45 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25
等级B：≤0.16 ≤0.55 0.80-1.50 0.040 0.040
等级A: ≤0.20 ≤0.55 1.00-1.60 0.045 0.045
等级B：≤0.20 ≤0.55 1.00-1.60 0.040 0.040
GB Q345 等级C：≤0.20 ≤0.55 1.00-1.60 0.035 0.035
Si
Mn P ≤ S ≤ Cr
Ni
Mo Cu≤ V
B
Tensil Yield
CE Strength strength Mpa Mpa
Elongate Reduction Impact rate % of area % test J
Hardness Heat HB treatment
GB 75 0.72-0.80 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25
等级D：≤0.20 ≤0.55 1.00-1.60 0.030 0.030
等级E：≤0.20 ≤0.55 1.00-1.60 0.025 0.025
等级A: ≤0.20 ≤0.55 1.00-1.70 0.045 0.045
等级B：≤0.20 ≤0.55 1.00-1.70 0.040 0.040
0.02-0.15 0.02-0.15 0.02-0.15 0.02-0.15 0.02-0.15 0.02-0.15 0.02-0.15 0.02-0.20 0.02-0.20 0.02-0.20 0.02-0.20 0.02-0.20 0.02-0.20 0.02-0.20
410 245 26 450 275 24 490 295 22 540 315 20 560 335 18 590 355 17 620 375 15 645 390 13 695 410 11 735 430 9 785 450 8
390-570 295 23 390-570 295 23 470-630 345 21 470-630 345 21 470-630 345 22 470-630 345 22 470-630 345 22 490-650 390 19 490-650 390 19 490-650 390 20 490-650 390 20 490-650 390 20 520-680 420 18 520-680 420 18
0.25
645 380 13 35
255 N
GB 60 0.57-0.65 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25
0.25
675 400 12 35
255 N
GB 65 0.62-0.70 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25
0.25
1080 880 7 30
285 N
GB 80 0.77-0.90 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25
0.25
1080 930 6 30
285 N
GB 85 0.82-0.90 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25
0.25
695 410 10 30
255 N
GB 70 0.67-0.75 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25
0.25
715 420 9 30
269 N
Standard Material
C
CHEMICAL COMPOSITION %
MECHANICAL PROPERTIES ≥
0.25
600 355 16 40 39 229 N
GB 50 0.47-0.55 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25
0.25
630 375 14 40 31 241 N
GB 55 0.52-0.60 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25
0.25
1130 980 6 30
302 N
LONGXING GB 15Mn 0.12-0.19 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25
GB 20Mn 0.17-0.24 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25 GB 25Mn 0.22-0.30 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25 GB 30Mn 0.27-0.35 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25 GB 35Mn 0.32-0.40 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25 GB 40Mn 0.37-0.45 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25 GB 45Mn 0.42-0.50 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25 GB 50Mn 0.48-0.56 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25 GB 60Mn 0.57-0.65 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25 GB 65Mn 0.62-0.70 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25 GB 701Mn 0.67-0.75 0.17-0.37 0.70-1.00 0.035 0.035 ≤0.25 ≤0.25
0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25
2.1.2 低合金高强度钢、耐候钢和GB/T 1591-94）
等级A：≤0.16 ≤0.55 0.80-1.50 0.045 0.045 GB Q295
Si Mn P ≤ S ≤ Cr Ni Mo Cu≤ V
各国结构用钢 2.1.1 碳素结构钢和优质碳素结构钢 （1）GB标准碳素结构钢（GB700-88）
GB Q195 0.06-0.12 ≤0.30 0.25-0.5 0.045 0.05 ≤0.30 ≤0.30 GB Q215A 0.09-0.15 ≤0.30 0.25-0.5 0.045 0.05 ≤0.30 ≤0.30 GB Q215B 0.09-0.15 ≤0.30 0.25-0.55 0.045 0.045 ≤0.30 ≤0.30 GB Q235A 0.14-0.22 ≤0.30 0.30-0.65 0.045 0.05 ≤0.30 ≤0.30 GB Q235B 0.12-0.20 ≤0.30 0.30-0.70 0.045 0.045 ≤0.30 ≤0.30 GB Q235C ≤0.18 ≤0.30 0.35-0.80 0.040 0.040 ≤0.30 ≤0.30 GB Q235D ≤0.17 ≤0.30 0.35-0.80 0.035 0.035 ≤0.30 ≤0.30 GB Q255A 0.18-0.28 ≤0.30 0.40-0.70 0.045 0.050 ≤0.30 ≤0.30 GB Q255B 0.18-0.28 ≤0.30 0.40-0.70 0.045 0.045 ≤0.30 ≤0.30 GB Q275 0.28-0.38 ≤0.35 0.50-0.80 0.045 0.050 ≤0.30 ≤0.30
60 55 55 60
55 55 55 50 71 50 63 45 55 45 47
Hardness Heat HB treatment
N N
N
N N
131 N 137 N 143 N 131 N
N 137 N 143 N 156 N 170 N 179 N 197 N 217 N
GB 45 0.42-0.50 0.17-0.37 0.50-0.80 0.035 0.035 ≤0.25 ≤0.25