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STAINLESS ACID-RESISTANT STEEL 1.4438, X2CRNIMO18-15-4, AISI 317L ACCORDING TO EN 10088-1.

Standard Steel Grade
Chemical Composition %
C: Mn: Si: P: S: Cr: Ni: Mo: N:
EN 1.4438 - X2CrNiMo18-15-4
<0.030 <2.0 <1.0 <0.045 <0.030 17.5 - 19.5 13.0 - 17.0 3.0 - 4.0 <0.11
ASTM AISI 317L - UNS S31703
<0.035 <2.0 <1.0 <0.045 <0.030 18.0 - 20.0 11.0 - 15.0 3.0 - 4.0 -
NF Z3CND19-15-04
<0.03 <2.0 <0.75 <0.035 <0.010 17.5 - 19.5 14.0 - 16.0 3.0 - 4.0 -
BS 317S12
<0.08 <2.0 <1.0 <0.045 <0.030 17.5 - 19.5 14.0 - 17.0 3.0 - 4.0 -

1.4438, X2CrNiMo18-15-4, AISI 317L - specification and application

Austenitic acid-resistant special steel, used in the production of heat exchangers, pipelines, fittings, parts of radiators and pumps, connectors, tanks for chemical compounds, bolts and nuts. It is mainly used in the chemical, petrochemical, nitrogen, food, refinery, cryogenic and paper industries. Steel resistant to intergranular corrosion.


Mechanical properties of 1.4438, AISI 317L

  • Tensile strength, Rm: 500 - 700 MPa
  • The yield point, Rp0,2: >200 MPa
  • Elongation, A:> 40%
  • Modulus of elasticity, E: 200 GPa
  • Hardness, HB: <215
  • Specific resistance, Ω: 0.85 mkOhm * m
  • Impact resistance, KV: > 60J
  • Linear expansion coefficient, α: 16.0 * 10-6 K-1
  • Thermal conductivity, λ: 14.0 W * m-1 * K-1
  • Thermal capacity, cp: 500 J * kg-1 * K-1
Temperature (℃) 100 150 200 250 300 350 400 450 500 550
Modulus of elasticity, E (GPa) 194 - 186 - 179 - 172 - 165 -
The yield point, Rp0,2 (MPa) >172 >157 >147 >137 >127 >120 >115 >112 >110 >108
Linear expansion coefficient, α (* 10-6 K-1) 16.0 - 16.5 - 17.0 - 17.5 - 18.0 -

Heat and plastic treatment of 1.4438, AISI 317L

  • forging and rolling at temperatures 1150 - 800℃
  • Supersaturation at 1020 - 1100 ℃


In the 1.4438, AISI 317L grade we deliver:

  • Drawn and peeled bars 1.4438, X2CrNiMo18-15-4, AISI 317L
  • Stainless steel tubes 1.4438, X2CrNiMo18-15-4, AISI 317L
  • Cold-rolled, hot-rolled stainlees sheets 1.4438, AISI 317L
  • Elements cut from sheets - flat bars 1.4438, AISI 317L

Other grades designations:
X 2 CRNIMO18-15-4, TP317L, 317 L, 1.4438, 1.4476, 317S12, 317 S 12, X3CRNIMO18-16-5, SUS317L, T 7MONICR180, UNS S31703, 317-L, Z3CND19-15-04, Z 3 CND 19-15-04.

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