Industrial Cold Rolled Duplex Steel Plate AISI 2205 S31083 S323304 904L S32750

UNS S31803 DUPLEX STAINLESS STEEL STOCKHOLDERS AND SUPPLIERS, DELIVERING TO THE WHOLE OF THE UK. WEST YORKSHIRE STEEL ARE SUPPLIERS OF UNS S31803, A CHROMIUM NICKEL MOLYBDENUM AUSTENITIC FERRITIC GRADE. IT COMBINES IMPROVED RESISTANCE TO STRESS CORROSION CRACKING, PITTING, CREVICE CORROSION AND HIGH STRENGTH IN COMPARISON WITH OTHER STAINLESS STEEL GRADES. UNS S31803 GRADE DUPLEX RESISTS CHLORIDE ENVIRONMENTS AND SULPHIDE STRESS CORROSION. IT IS APPROXIMATELY DOUBLE THE YIELD STRENGTH OF STANDARD AUSTENITIC STAINLESS STEEL GRADES. AS WITH OTHER DUPLEX STAINLESS STEEL SPECIFICATIONS OXIDATION RESISTANCE IS GOOD AT HIGH TEMPERATURE, THOUGH IT IS PRONE TO EMBRITTLEMENT WHEN EXPOSED TO TEMPERATURES ABOVE 300°C AND IS PRONE TO EMBRITTLEMENT AT 475°C WHEN EXPOSED FOR 2 HOURS ONLY. IT IS ALSO SUBJECT TO EMBRITTLEMENT BETWEEN 370-540°C WHEN EXPOSED OVER A LONGER PERIOD.

Super Duplex Stainless Steel – Alloy 2507 (UNS S32750 and UNS S32760) Specifications

1. Super Duplex Plates, Sheet, Coil, and Strip: ASTM A240, ASME A 240
2. Super Duplex Seamless Pipes / Tubes: ASTM A 789 / 790, ASME SA 789 / 790
3. Super Duplex Welded Pipes / Tubes: ASTM A 789 / 790, ASME SA 789 / 790
4. Super Duplex Bars, Rods, Wire: ASTM A 276 / 479, ASME SA 276 / 479
5. Super Duplex Pipe Fittings & Flanges: ASTM A 815, ASME SA 815
6. Super Duplex Forged Flanges: ASTM A182 Grade F55
7. Super Duplex Forgings: ASTM A473

Super Duplex – S32760 Grade Stainless Steel Chemical Composition, %

Super Duplex – S32750 / 2507 Grade Stainless Steel Chemical Composition, %

Physical & Mechanical Properties of Super Duplex 2507 Stainless Steel (UNS S32750 and UNS S32760)

ABOUT Duplex 2205 Stainless Steel

Duplex 2205 Stainless Steel Introduction
Duplex 2205 Stainless Steel Key Properties
Duplex 2205 Stainless Steel Composition
Duplex 2205 Stainless Steel Mechanical Properties
Duplex 2205 Stainless Steel Physical Properties
Duplex 2205 Stainless Steel Grade Specification Comparison
Duplex 2205 Stainless Steel Possible Alternative Grades
Duplex 2205 Stainless Steel Corrosion Resistance
Duplex 2205 Stainless Steel Heat Resistance
Duplex 2205 Stainless Steel Heat Treatment
Duplex 2205 Stainless Steel Welding
Duplex 2205 Stainless Steel Machining
Duplex 2205 Stainless Steel Fabrication
Duplex 2205 Stainless Steel Applications

Duplex 2205 Stainless Steel Chemical Composition

Fe, <0.03% C, 21-23% Cr, 4.5-6.5% Ni, 2.5-3.5% Mo, 0.8-2.0% N, <2% Mn, <1% Si, <0.03% P, <0.02% S

Duplex 2205 Stainless Steel Introduction

Duplex 2205 stainless steel (both ferritic and austenitic) is used extensively in applications that

require good corrosion resistance and strength. The S31803 grade stainless steel has undergone

a number of modifications resulting in UNS S32205, and was endorsed in the year 1996.

This grade offers higher resistance to corrosion.

At temperatures above 300°C, the brittle micro-constituents of this grade undergo precipitation,

and at temperatures below -50°C the micro-constituents undergo ductile-to-brittle transition;

hence this grade of stainless steel is not suitable for use at these temperatures.

Duplex 2205 Stainless Steel Key Properties

The properties that are mentioned in the below tables pertain to flat rolled products such as plates,

sheets and coils of the ASTM A240 or A240M. These may not be uniform across other products

such as bars and pipes.

Duplex 2205 Stainless Steel Composition

Table 1 provides the compositional ranges for grade 2205 duplex stainless steel.

Table 1 - Composition ranges for 2205 grade stainless steels

Duplex 2205 Stainless Steel Mechanical Properties

The typical mechanical properties of grade 2205 stainless steels are listed in the table below.

Grade S31803 has similar mechanical properties to that of S32205.

Table 2 - Mechanical properties of 2205 grade stainless steels

Duplex 2205 Stainless Steel Physical Properties

The physical properties of grade 2205 stainless steels are tabulated below. Grade S31803 has similar physical properties to that of S32205.

Table 3 – Physical properties of 2205 grade stainless steels

Duplex 2205 Stainless Steel Grade Specification Comparison

Table 4 provides the grade comparison for 2205 stainless steels. The values are a comparison of functionally similar materials. Exact equivalents may be obtained from the original specifications.

Table 4 - Grade specification comparisons for 2205 grade stainless steels

Duplex 2205 Stainless Steel Possible Alternative Grades

Given below is a list of possible alternative grades, which may be chosen in place of 2205.

Table 5 - Grade specification comparisons for 2205 grade stainless steels

Duplex 2205 Stainless Steel Corrosion Resistance

Grade 2205 stainless steel exhibits excellent corrosion resistance, much higher than that of grade 316. It resists localized corrosion types like intergranular, crevice and pitting. The CPT of this type of stainless steel is around 35°C. This grade is resistant to chloride stress corrosion cracking (SCC) at temperatures of 150°C. Grade 2205 stainless steels are apt replacements to austenitic grades, especially in premature failure environments and marine environments.

Material summary and usage

S31803 steel is ultra-low carbon dual- phase stainless acid resistant steel. It is provided with excellent pitting corrosion and crevice corrosion resistant performances. In addition, nitrogen, as a strong element that forms and stabilizes austenite, still ensures the existence of certain amount of austenite in the structure even if after welding or heating under high temperature, and makes it difficult to form single-phase ferrite. The dual-phase proportion is not sensitive to the change of heating temperature.

Chemical composition(%)

Mechanical properties

Application fields

It is suitable for manufacturing various industrial heat exchangers, especially in the H2S condition that contains chlorides, acetic acid and other organic acid solutions: conveying pipes in oilfields, oil ports and well heads; air coolers for oilfields and gas fields; air coolers for refineries and hydrogen cracking towers; PE coolers; seawater desalting exchangers, etc.

Packing and delivery

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