441 Stainless Steel

Description:

Type 441 Stainless Steel is a ferritic stainless steel which provides good high-temperature strength (exceeding that of Types 409 and 439 Stainless Steels) plus good corrosion resistance in many exhaust gas environments (equivalent to Type 439 and 18 Cr-Cb Stainless Steels). . Ferritic steels are not inherently strong at elevated temperatures, but columbium additions coupled with appropriate solution annealing markedly improve long-time creep rupture strength. Type 441 is dual stabilized with niobium and titanium to provide good weld ductility and resistance to intergranular corrosion in the weld heat affected zone.

Product Forms:

Sheet, Strip

Specifications:

ASTM A240 (S43940) and EN 10088-2 (1.4509)

Typical Applications:

Automotive exhaust tube and components

Chemical Composition:

ElementUNS 43940EN 1.4509
Carbon 0.030 max. 0.030 max.
Manganese 1.00 max. 1.00 max.
Sulfur 0.015 max. 0.015 max.
Phosphorus 0.040 max 0.040 max.
Silicon 1.00 max. 1.00 max.
Chromium 17.5 – 18.5 17.5 – 18.5
Titanium 0.10 – 0.60 0.10 – 0.60
Nitrogen - 0.045 max.
Niobium 0.30+(9xC) min. 0.30+(9xC) min.– 1.00 max.

Mechanical Properties:

TypeYield Strength 0.2% offset (KSI)Tensile Strength (KSI)% Elongation (2" Gauge length)Hardness Rockwell
UNS S43940 36 min. 62 min. 18 min. HRB 88 max.
EN 1.4509 36 min. 62 - 91 18 min.