Name: ASTM A789 UNS S31803 Duplex Stainless Steel Tube Seamless or Welded
Brand: Yuhong Group Co.,Ltd
SKU: ASTM A789 UNS S31803 1.4462
Price: 120000.00 USD
Availability: InStock

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ASTM A789 UNS S31803 Duplex Stainless Steel Tube Seamless or Welded

Product Details:

Place of Origin:	China
Brand Name:	YUHONG
Certification:	ABS, LR, GL, DNV, NK, TS, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number:	ASTM A789 UNS S31803 1.4462

Payment & Shipping Terms:

Minimum Order Quantity:	100 kgs
Price:	Negotiable
Packaging Details:	Ply-wooden Case /Iron Case/ Bundle with plastic Cap
Delivery Time:	±7days
Payment Terms:	L/C,T/T
Supply Ability:	According to customer's request

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Detailed Product Description

Product Name:	ASTM A789 UNS S31803 Duplex Steel Tube	Specification:	ASTM A789
Grade:	UNS S31803	O.D.:	1/2”to 8"
W.T.:	AW/MW	Type:	Seamless Or Welded
End:	Plain End, Beveled End	Application:	Heat Exchanger, Oil And Gas, Boiler, Reactor
Highlight:	Welded Duplex Stainless Steel Tube , ASTM A789 Duplex Stainless Tube , UNS S31803 Duplex Stainless Tube

ASTM A789 UNS S31803 1.4462 Seamless Welded Duplex Stainless Steel Tube

Attribute	Value
Product Name	ASTM A789 UNS S31803 Duplex Steel Tube
Specification	ASTM A789
Grade	UNS S31803
O.D.	1/2" to 8"
W.T.	AW/MW
Type	Seamless Or Welded
End	Plain End, Beveled End
Application	Heat Exchanger, Oil And Gas, Boiler, Reactor

Product Overview

YUHONG brand goods have been exported to more than 85 countries with over 35 years of experience. Our strict quality control, excellent sales service, and timely delivery have earned us repeat orders from satisfied clients worldwide.

ASTM A789 UNS S31803 (1.4462) Seamless and Welded Duplex Stainless Steel Tube is a high-performance corrosion-resistant steel tube designed for demanding industrial applications. Manufactured from duplex stainless steel (austenitic-ferritic structure), it offers excellent strength, pitting resistance, and stress corrosion cracking resistance. Available in both seamless and welded forms with controlled average/minimum wall thickness to ensure structural integrity under high-pressure and harsh environments.

Chemical & Mechanical Properties

ASTM A789 UNS S31803 Chemical Composition (%)

C	Mn	P	S	Si	Cr	Ni	Mo	N
≤ 0.030%	≤ 2.00%	≤ 0.030%	≤ 0.020%	≤ 1.00%	21.0 - 23.0%	4.5 - 6.5%	2.5 - 3.5%	0.08 - 0.20%

Mechanical Properties

Property	Standard Value
Tensile Strength	620 - 795 MPa
Yield Strength (0.2% offset)	≥ 450 MPa
Elongation	≥ 25%
Hardness (Brinell)	≤ 32 HRC
(-46°C) Charpy V-notch (-46°C)	≥40 J

Key Mechanical Characteristics

High Strength Characteristics
Excellent Toughness
Excellent Fatigue Performance
Physical Properties

Key Advantages

Superior Strength-to-Weight Ratio: Yield strength (≥450MPa) is twice that of 304 stainless steel, with tensile strength (620-795MPa) significantly exceeding conventional austenitic grades. Allows 20-30% material savings compared to standard stainless steels.
Outstanding Corrosion Resistance: Dual protection from Cr(21-23%)+Mo(2.5-3.5%)+N(0.08-0.20%). Specialized resistance to chloride stress corrosion cracking, pitting/crevice corrosion (PREN ≥35), and acid media.
Cost-Effectiveness: 40-60% savings vs nickel alloys, 2-3x service life vs 316L. Excellent weldability (no PWHT required), CTE similar to carbon steel (13.5 ×10⁻⁶/℃).
Versatile Performance: Stable performance from -50℃ to 300℃. Dual-phase benefits: Ferrite phase for strength + Austenite phase for toughness.

Key Applications