Alloy 28

Main reference standards

Density Kg/dm3:8

PLATES
ASTM / ASME:B/SB 709
EN:10028-7

WELDED PIPES
ASTM / ASME:-
EN:10217-7

SEAMLESS PIPES
ASTM / ASME:B/SB 668
EN:10216-5

FITTINGS
ASTM / ASME:-
EN:10253-4

VdTÜV
483

Mechanical and chemical characteristics

Reference:B/SB 709
Tensile Strength min N/mm2:500
Yield Point min N/mm2:214
Elongation 2” min %:40
Hardness max HB:-
Hardness max HRB:70 – 90
C% max:0.03
Mn% max:2.50
Si% max:1.00
P% max:0.03
S% max:0.03
Cr%:26 – 28
Ni%:29.5 – 32.5
Mo%:3 – 4
Fe%:Resto Balance
Cu% max:0.6 – 1.4
Other elements:-

Properties and main applications

* Super-austenitic stainless steel with very high nickel and chromium contents. The alloy has very good corrosion resistance for general purposes. It behaves particularly well in sulphuric and phosphoric acid environments, even when contaminated by chlorides and fluorides. The high nickel content improves its stress corrosion cracking resistance. The combined chromium and molybdenum additions contribute to increase drastically the localized corrosion resistance. The alloy behaves much better than alloy 825 and could be considered in some applications (sour gas) to replace the more expensive 625 grade. * Chemical and offshore applications including sour gas fields, production and use of vinyl chlorides, acetic acid, sulphuric acid and superphosphoric acid, reactors tanks, agitators ,impellers, piping systems, cyclone evaporators, surface coolers, circulation pumps, agitators, tubes for heat exchangers.


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