... temperature resistant with black painting 3.ll the production process are made under the ISO9001,ISO2000 strictly. -product ... -36 high-pressure seamless pipe for chemical fertilizer equipment 20,16Mn,Q345GB6479-2000Fertilizer Equipment-pipeline25-426×6-40 Marine tube ... , mining, textile, electric power, boilers, drinking water, machinery, military industryDN80-1500-square pipeQ195,Q235,Q345,20#GB/T6278 ...