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MECHANICAL AND CHEMICAL VALUES FOR:

DUPLEX UNS 31803 FLANGES

ASTM specifications regulate approved raw materials from which flanges can be made. Forged or Rolled alloy steel pipe flanges, forged fittings and valves for high temperature applications

DUPLEX, AN AUSTENITIC FERRITIC IRON CHROMIUM-NICKEL ALLOY WITH MOLYBDENUM ADDITION. GOOD RESISTANCE TO PITTING, HAS A HIGH TENSILE STRENGTH AND HIGHER RESISTANCE TO STRESS CORROSION CRACKING AT MODERATE TEMPERATURES TO THAT OF CONVENTIONAL AUSTENITIC STAINLESS STEELS.

%C

%Cr

%Ni

%Mo

%Mn

%S

%P

%Si

%N

0.03

21.0-23.0

4.5-6.5

2.5-3.5

2.00

0.020

0.030

1.00

0.08-0.20

CHEMICAL COMPOSITION (All values are maximum unless otherwise stated)

YIELD

TENSILE

ELONGATION

REDUCTION OF

HARDNESS

ASTM

STRENGTH

STRENGTH

(MIN)

AREA (MIN)

(MAXIMUM)

SPECIFICATION

MECHANICAL PROPERTIES

(ksi)

(mpa)

90

620

ASTM A812 F51

(HB) (HRC)

45

(ksi) (mpa) 65 450

20

-

*

-

*

  • *

    Nace MR0175A limits the supplies hardness to 35 HRC MAX

PREn (PITTING RESISTANCE EQUIVALANT) (%Cr) + (3.3 x %Mo) + (16 x %N) HEAT TREATMENT SOLUTION ANNEALED AT 1020 DEG C—1100 DEG C WATER QUENCH EQUIVALENT GRADES

UNS

SB EN

31803

1.4462

SWEDEN SS

2377

GERMANY DIN

X 2 CrNiMoN

22.5.3

FRANCE ANFOR

SANDVIK +

Z2 CND 22.05.03

SAF 2205

Duplex is a material having an approximate equal amount of austenite and ferrite. These combine excellent corrosion resistance with high strength. Mechanical properties are approximately double those of singular austenitic steel and resistance

to stress corrosion cracking is superior to type 316 stainless steel in chloride solutions. Duplex material has a ductile / brittle transition at approximately

  • -

    50 degºC. High temperature use is usually restricted

to a maximum temperature of 300degºC for indefinite use due to embrittlement

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