high weather resistant structural steel plate (q345 series)-k8凯发官网
high weather resistant structural steel plate (q345 series)
1 main use
q345 series high weather resistant structural steel plates with thickness specifications of 6 to 50 mm include q355gnh 09cupcrni, spa-h, q295gnh, q355nh, s355k2w, s355j2w, s355j0w and other steel grades. these steels are alloyed by cu, p, cr, ni, etc. a protective layer is formed on the surface of the metal substrate to have high atmospheric corrosion resistance. the weather resistance of this type of steel is better than that of weathered steel for welded structures, so it is called high weather resistant structural steel. this type of steel is widely used in railway vehicles, various weather-resistant building structural parts (especially for industrial atmospheric environments), bridge auxiliary structural parts and so on.
2 grades and standards
grade spa-h; standard: jis g3125-2004 "high atmospheric corrosion resistant rolled steel plate"
grade q355gnh; standard: gb/t4171-2008
grade q295gnh; standard gb/t4171-2008
grade q355nh; standard: gb/t4171-2008
grade s355k2w/s355j2w/s355j0w; standard: en10025-5:2004
3 technical conditions of supply
3.1 product specifications
6～50×1800～4050×l mm
3.2 chemical composition
table 1 chemical composition, %
牌号 | c≤ | si≤ | mn≤ | p | s≤ | cu | cr | ni |
spa-h | 0.12 | 0.75 | 0.60 | 0.07～0.15 | 0.040 | 0.25～0.60 | 0.30～1.25 | ≤0.65 |
q355gnh | 0.12 | 0.20-0.75 | ≤1.00 | 0.07-0.15 | 0.020 | 0.25-0.55 | 0.30-1.25 | ≤0.65 |
09cupcrni | 0.12 | 0.75 | ≤1.0 | 0.07-0.15 | 0.040 | 0.25-0.55 | 0.30-1.25 | ≤0.65 |
q295gnh | 0.12 | 0.10-0.40 | 0.20-0.50 | 0.07-0.12 | 0.020 | 0.25-0.45 | 0.30-0.65 | ≤0.65 |
q355nh | 0.16 | 0.50 | 0.50－1.50 | 0.030 | 0.030 | 0.25-0.55 | 0.40-0.80 | ≤0.65 |
s355j0w | 0.16 | 0.50 | 0.50－1.50 | 0.030 | 0.030 | 0.25-0.55 | 0.40-0.80 | / |
s355j2w | 0.16 | 0.50 | 0.50－1.50 | 0.030 | 0.030 | 0.25-0.55 | 0.40-0.80 | 0.16 |
s355k2w | 0.16 | 0.50 | 0.50－1.50 | 0.030 | 0.030 | 0.25-0.55 | 0.40-0.80 | 0.16 |
3.3mechanical properties
table 2 mechanical properties
牌号 | rel/reh,mpa，≥ | rm,mpa，≥ | a,%，≥ | 冷弯180° |
spa-h | 355 | 490 | 15 | d=1.5a |
q355gnh | 355 | 490-630 | 22 | d=2a |
09cupcrni | 345 | 480 | 22 | d=1.5a |
q295gnh | 295 | 430-560 | 24 | d=2a |
s355k2w | 355 | 470-630 | 20 | / |
s355j2w | 355 | 470-630 | 20 | / |
s355j0w | 355 | 470-630 | 20 | / |
表2 mechanical properties
牌号 | 厚度，mm | rel，mpa，≥ | rm，mpa | a，% | 冷弯 |
q355nh | ≤16 | 355 | 490～630 | ≥22 | d=2a |
〉16～40 | 345 | d=3a | |||
〉40～60 | 335 | ≥21 | d=3a |