sheng xiang guo,Suzhou Rivow Steel Tube Co.,Lt
 
1．ASME SA106
2．ASME SA179
3．ASME SA192
4．ASME SA210
5．ASME SA213
6．ASME SA335
7．API SPEC 5CT
8．DIN17175
9．BS3059
10．JIS G3454
11．JISG2461