ASTM A790 Duplex Stainless Steel Pipe

What is ASTM A790? ASTM is the American Society for Testing and Materials, and ASTM A790 is the "Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe". A790 pipes will be manufactured by seamless or automatic welding processes. The A790 standard chemical composition requires alloy steel containing chromium, molybdenum and a small amount of nitrogen, etc. The pipes are stronger and more corrosion-resistant, suitable for harsh environments including chloride and sulfide environments. Our company is a duplex steel pipe supplier with 15+ export experience, contact us for more information and free quotes!

 

ASTM A790 Duplex Stainless Steel Pipe Specifications

Specification	ASTM A790 and ASME SA790
Standard	ASTM, AISI, EN, GB, DIN, JIS, ASME
Seamless Pipe OD	6.00MM Outer Diameter upto 250MM Outer Diameter, Sizes upto 12Inch NB
Welded Pipe size	5.0 MM To 1219.2 MM
Thickness	0.3 To 50 MM
Schedule	5, 10, 40, 80, 80S, 160, XXS, XS
Pipe Finish	NO.1, Polished, 2B, Annealed and Pickled, BA, HL, 8K, Mirror finish
Form	Round, Square, Hollow, Hydraulic, Coiled, Straight Pipes
Length	Double Random, Single Random, Standard, and Cut length

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ASTM A790 Standard Dimensional Tolerance

Standard	Outer Diameter(mm)		Wall Thickness(mm)		Length(mm)
	range	deviation	range	deviation	deviation
ASTM A790	10.3-48.3	0.4/-0.8	10.3-73	-1.6	6
	48.3-114	±0.8	D≥88.9		6
	114-219	1.6/-0.8	T/d≤5%	-1.8	6
	219-457	2.4/-0.8	T/d＞5%	-1.2	6
	457-660	3.2/-0.8	D≥20	-1.2	6

 

ASTM A790 Duplex Stainless Steel Pipe Chemical Composition

Grade	C≤	Mn≤	P≤	S≤	Si≤	Ni	Cr	Mo	N	Cu
S31803	0.03	2.00	0.03	0.02	1.00	4.5–6.5	21.0–23.0	2.5–3.5	0.08–0.20	-
S32205	0.03	2.00	0.03	0.02	1.00	4.5–6.5	22.0–23.0	3.0–3.5	0.14–0.20	-
S32750	0.03	1.20	0.035	0.02	0.80	6.0-8.0	24.0-26.0	3.0-5.0	0.24-0.32	0.5
S32760	0.05	1.00	0.03	0.01	1.00	6.0-8.0	24.0-26.0	3.0-4.0	0.20-0.30	0.50–1.00

 

ASTM A790 Material Mechanical Properties

Mechanical properties	Tensile, min, ksi[MPa]	Yield, min, ksi[MPa]	Elongation, %(min)	Hardness, HB(max)
S31803	90 [620]	65 [450]	25	290
S32205	95 [655]	65 [450]	25	290
S32750	116 [800]	80 [550]	15	300
S32760	109 [750]	80 [550]	25	300

 

ASTM A790 Pipe Heat Treatment

UNS Designation	Temperature °F [°C]	Quench
S31803	1870-2010℉(1020-1100℃)	Rapid cooling in air or water
S32205	1870-2010℉(1020-1100℃)	Rapid cooling in air or water
S32750	1880-2060℉(1025-1125℃)	Rapid cooling in air or water
S32760	1960-2085℉(1070-1140℃)	Rapid cooling in air or water

 

Applications of ASTM A790 Stainless Steel Pipe

• Marine Environment
• Pollution Control Equipment
• Gas and Petroleum Refining
• Paper and Pulp
• Chemical Processing, Storage and Transportation

 

ASTM A790 Duplex Pipe Test Requirements

• Tensile Test
• Hardening Test
• Flattening Test
• Hydrostatic or Nondestructive Electrical Test
• Eddy Current or Ultrasonic Test (UT)

 

 

 

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