Characteristic:
1)high temperatures,
2)high pressure,
3)corrosion resistance.
Used for:
1) high-temperature,
2)high-pressure pipelines (steam and the oil industry, petroleum chemical industry) tower, tank, heat exchangers, pipelines and other machine interface. The application of the

Materials.:
soft iron / SS304/SS316 / carbon / SS321 alloys .

Standards:
ANSI B16.5-1973, JPI-75-15-70, GB 699, GB1220, JB755, HG20633-97

Specifications : from the R11-R105 series,