1.4438 / 317L / X2CrNiMo18-15-4 Material Data Sheet

1.4438 / 317L / X2CrNiMo18-15-4.pdf

 

What is the equivalent material of 1.4438 stainless steel?

Property	Description
EN Standard Name	1.4438
AISI/ASTM Equivalent	AISI 317L
DIN Designation	X2CrNiMo18-15-4
UNS Number	S31703
Product Forms	Plate, Sheet, Pipe, Tube, Bar, Fittings
Standards	ASTM A240, A312, A213, EN 10088-1, ISO 15510

What is the chemical composition of X2CrNiMo18-15-4?

Compared with 316L, 317L contains more nickel and molybdenum, offering improved pitting resistance.

Element	Content (%)
Carbon (C)	≤ 0.030
Chromium (Cr)	18.0 – 20.0
Nickel (Ni)	13.5 – 15.0
Molybdenum (Mo)	3.0 – 4.0
Manganese (Mn)	≤ 2.00
Silicon (Si)	≤ 1.00
Phosphorus (P)	≤ 0.045
Sulfur (S)	≤ 0.015
Nitrogen (N)	≤ 0.10
Iron (Fe)	Balance

What are the mechanical properties of AISI 317L?

Property	Value (Typical)
Tensile Strength (Rm)	540 – 750 MPa
Yield Strength (Rp0.2)	≥ 240 MPa
Elongation (A5)	≥ 40%
Hardness (HBW)	≤ 220
Modulus of Elasticity	~200 GPa
Density	~8.0 g/cm³
Melting Range	1370–1395 °C

What is the standard of 1.4438 stainless steel?

Grade :	X2CrNiMo18-15-4
Number:	1.4438
Classification:	Austenitic stainless steel - special grade
Density:	8 g/cm ³
Standard:	EN 10088-2: 2005 Stainless steels. Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes EN 10088-3: 2005 Stainless steels. Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes EN 10028-7: 2007 Flat products made of steels for pressure purposes. Stainless steels EN 10217-7: 2005 Welded steel tubes for pressure purposes. Stainless steel tubes EN 10253-3: 2008 Butt-welding pipe fittings. Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements EN 10253-4: 2008 Butt-welding pipe fittings. Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements EN 10088-1: 2005 Stainless steels. List of stainless steels EN 10088-5: 2009 Stainless steels. Technical delivery conditions for bars, rods, wire, sections and bright products of corrosion resisting steels for construction purposes EN 10088-4: 2009 Stainless steels. Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes

What is the PREN value of 317L?

PREN (Pitting Resistance Equivalent Number): ~33–35, higher than 316L (~24–27)

What is the difference between 1.4438 and 316L?

The main difference between 1.4438 (317L) and 316L (1.4404) stainless steel lies in their molybdenum and nickel content, which directly affects their corrosion resistance.
1.4438 contains more molybdenum (3.0–4.0%) and nickel (13.5–15%) than 316L (Mo ~2.0–2.5%, Ni ~10–13%), giving it better resistance to pitting and crevice corrosion, especially in chloride-rich or acidic environments. This makes 317L more suitable for demanding chemical processing or marine applications, while 316L is preferred in general corrosion-resistant applications with lower cost.

📦 Supply Forms

Plates & Sheets: Hot/Cold rolled, 2B, No.1, No.4, BA finish

Pipes & Tubes: Seamless & welded (ASTM A312 / A213)

Bars & Rods: Round, square, hex

Coils & Strips: For heat exchanger and tank fabrication

Fittings & Flanges: For pressure pipeline systems

Mill test certificates (EN 10204 3.1/3.2) available upon request.

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