ASTM A789 UNS S32205 Duplex Stainless Steel Tubes

 

S32205 duplex stainless steel pipe is a type of super duplex stainless steel pipe composed of 21% chromium, 2.5% molybdenum, and 4.5% nickel nitrogen alloy. The chemical composition of S32205 duplex stainless steel pipe includes chromium (Cr) 22.0%-23.0%, nickel (Ni) 4.5%-6.5%, molybdenum (Mo) 3.0%-3.5%, manganese (Mn) up to 2.0%, and nitrogen (N) content ranging from 0.14% to 0.20%. These components impart unique properties to S32205 stainless steel pipe.

A789 S32205 Duplex Stainless Pipe Specification

Standard: ASTM A789, ASME SA789

Type: Seamless, Welded

Size: Customized Size

Wall Thickness: 0.5 - 12.7MM

Length: 1-12m Or As Your Requirements

Test: Corrosion Test, Chemical Analysis, Mechanical Testing, etc..

Application: Construction, Industry, Boiler, etc..

SA789 S32205 Duplex Steel Pipe Chemical Composition

UNS Designation	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu	Others
S32205	0.030	2.00	0.030	0.020	1.00	4.5–6.5	22.0–23.0	3.0–3.5	0.14–0.20	. . .	. . .

A789 S32205 Duplex Stainless Steel Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Special Test Requirements for S32205 Super Duplex Stainless Steel Pipe:

1. Tensile and Hardness Tests:
Compared to austenitic stainless steel, duplex stainless steel has high strength, but occasional end-user technical requirements may specify maximum values for strength or hardness. The introduction of maximum values for strength or hardness may draw from the experience of martensitic stainless steel, where high strength and hardness result from untempered martensite. However, duplex stainless steel does not form martensite during cooling. Its high strength and hardness are due to its high nitrogen content, its dual-phase structure, and work hardening that may occur during forming or straightening operations.
Hardness testing is an effective means of demonstrating that excessive cold working has not occurred during processing. However, when hardness testing is used for this purpose, it is important that the measurement location be between the surface and the center of the cross-section, rather than on surfaces where localized hardening and surface hardening occur.

2. Bend Test:
The bend test can demonstrate that the material has not undergone rolling cracks, but it may be challenging for large sections, small pieces, or certain geometric shapes of material. The bend test is not a conservative indicator of the quality of duplex stainless steel because the bending point may not be consistent with areas of nonconformance. Due to the directional nature of bending, certain conditions such as intermetallic phases along the centerline may not be detectable.
Bend tests are typically part of qualifying welding procedures for austenitic stainless steel, as there is a risk of hot cracking in welds, especially for weld structures with high austenite content. Since duplex stainless steel does not have a tendency for hot cracking, bend tests are not significantly meaningful for evaluating weld quality. While a bend test may roughly detect an excess of ferrite if the test location coincides with the affected area, it cannot detect the presence of small amounts of detrimental intermetallic phases that may affect corrosion resistance and toughness.

3. Welding Production and Inspection:
Problems that may occur with duplex stainless steel are not always obvious to welders and cannot be detected by non-destructive testing methods. Welders must recognize that the overall quality of welds depends on strict adherence to welding procedures, measured by their toughness and corrosion resistance in use. Deviations from prescribed welding procedures may not necessarily be detected in the workshop, but each deviation poses a risk for material safety and economic use. 

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