1. weld, seamless, forged elbow 2. pipe fitting 3. carbon, stainless steel, alloy steel 4. ASME, DIN, JIS, GB WeldSeamless Nominal SizeDN250- ... WP304, A403 WP304L, A403 WP316, A403 WP316L, A403 WP321 Alloy steel: A234 WP12, A234 WP11, A234 WP22, A234 WP5, A420 ... , 1.0488 (1.0566) JISCarbon steel: PG370, PT410 Stainless steel:SUS304, SUS304L, SUS316, SUS316L, SUS321 Alloy steel: PA22, PA23, PA24, PA25, ...