Q690DThe formula for calculati

Q690D is less than or less than 0.18, less than 0.60, or less than 0.030, or less than 0.80, or less than 0.80 is less than or less than 0.30, or less than 0.30, or less than 0.004

The formula for calculating the carbon equivalent: CEV = C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15 RMB # 1, # 1, and 180de3717,and rmb2227 for the weeks of the dance

Fourth, mechanical properties

The result of the license plate test is described as the result or the measured value

Q690D Rp0.2 Mpa 640 or higher

Rm 730 Mpa or greater

A50%14 or more

180 ° cold bending d = 3 a in good condition

-- 20 ° C impact 47 J

The Q690D steel plate was tested with a slightly higher yield than the standard 100Mpa.

Test, sample, test method

The number of sample samples taken by the serial number is tested by sampling method

Chemical composition (smelting analysis) 1 / furnace GB/T20066 TB/T233, GBT4336, GB/T20125

2 stretch test 1 / batch GB/T2975 GB/T228

3 bending test 1 / batch GB/T2975 GB/T232

4 impact test 3 / batch GB/T2975 GB/T229

Non-destructive inspection shall be negotiated by non-destructive inspection standards