CCS Classification Duplex Stainless Steel Plate S31803/ S32205 Uns S31803

Duplex Steel Plate Specifications

Duplex Steel UNS S31803/S32205 Sheets, Plates, Coils Specification

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.

Duplex 2205 Stainless Steel Heat Resistance

The high oxidation resistance property of Grade 2205 is marred by its embrittlement above 300°C. This embrittlement can be modified by a full solution annealing treatment. This grade performs well at temperatures below 300°C.

Duplex 2205 Stainless Steel Heat Treatment

The best suited heat treatment for this grade is solution treatment (annealing), between 1020 - 1100°C, followed by rapid cooling. Grade 2205 can be work hardened but cannot be hardened by thermal methods.

Duplex 2205 Stainless Steel Welding

Most standard welding methods suit this grade, except welding without filler metals, which results in excess ferrite. AS 1554.6 pre-qualifies welding for 2205 with 2209 rods or electrodes so that the deposited metal has the right balanced duplex structure.

Adding nitrogen to the shielding gas ensures that adequate austenite is added to the structure. The heat input must be maintained at a low level, and the use of pre or post heat must be avoided. The co-efficient of thermal expansion for this grade is low; hence the distortion and stresses are lesser than that in austenite grades.

Duplex 2205 Stainless Steel Machining

The machinability of this grade is low due to its high strength. The cutting speeds are almost 20% lower than that of grade 304.

Duplex 2205 Stainless Steel Fabrication

The fabrication of this grade is also affected by its strength. Bending and forming of this grade requires equipment with larger capacity. Ductility of grade 2205 is lesser than austenitic grades; therefore, cold heading is not possible on this grade. In order to carry out cold heading operations on this grade, intermediate annealing should be carried out.

Duplex 2205 Stainless Steel Applications

Some of the typical applications of duplex steel grade 2205 are listed below:

• Oil and gas exploration
• Processing equipment
• Transport, storage and chemical processing
• High chloride and marine environments
• Paper machines, liquor tanks, pulp and paper digesters

Jiangsu Mittel Steel Industrial Limited is  located in Wuxi City,  a beautiful city near Shanghai.  Wuxi is close to  Shanghai (BAO STEEL) ,Zhangjiagang (ZPSS),Ningbo (BAO XIN),KUN SHAN (DKSS), enjoy excellent geographic location and convenient water, land and air transportation. , Wuxi become the biggest  stainless steel sheet ,plate and coil  supply Centers in China. Jiangsu Mittel Steel Industrial Limited was established in 1998 years. as one of the largest stockists and manufacturers of industrial grade Stainless Steel products and derivatives in Wuxi ,We keep a stock of 50000 tons every month, so we can delivery goods in fast time.

Our company supplies cold/hot-rolled stainless steel sheets,stainless steel coils and stainless steel Plate to many steel factories from athome and abroad, including Shanxi Taigang Iron& Steel CO, . Ltd (TISCO)Zhangjiagang Pohang (ZPSS), Shanghai BAO STEEL, Ningbo Baoxin and steel factories in Taiwan area, Mainland Chinese and foreign countries and regions. 

Our long-term business lines are 201.202.304(1.4301).304L.316.316L(1.4404).430.409L, 309S ,310S(1.4845).317L.904L.S31803(1.4462).S32750.S32760, Finish: 2B, BA, NO. 1 NO. 4, HL, 8K and so on...Meanwhile, our company is also engaged in the long-term supply of homemade & imported medium and thick plates, galvanized and carbon steel products. 

Adhering to the principle of "quality first and customer foremost",our company will offer long-term service to nationwide manufacturers of household appliances, elevators, tableware, ornaments, tanks and machines. We can offer precise frosted wiredrawing, 8K mirror finishing and skim board oil-abrasion of various specifications at any time. The precisely-processed products will meet your requirements for high quality. Our company is a modern enterprise integrating distribution and storage. 

If you are interested in any of our products or would like to discuss a custom order, please feel free to contact us. We are looking forward to forming successful business relationships with new clients around the world in the near future.