Stainless steel American standard butt welding flange

Material: Stainless steel
Color classification: [304 150LB] DN15 [304 150LB] DN20 [304 150LB] DN25 [304 150LB] DN32 [304 150LB] DN40 [304 150LB] DN50 [304 150LB]

Flange standard: American Standard HG20615-97
Pressure: 150LB/or PN20
Stamp: Yes. 304 DN-