316L stainless steel 1.4404 (NOUS 31603)

What is stainless steel 316L (NOUS 31603)1.4404?

1.4404 est un acier inoxydable austénitique résistant aux acides avec 17% Cr, 12% Ni et 2,0% Mo. En raison de sa teneur en Mo, ce matériau présente une résistance à la corrosion considérablement améliorée par rapport aux aciers inoxydables. 1.4404 résiste à l'action réductrice des acides organiques et inorganiques ainsi qu'aux fluides contenant des halogènes. En outre, cet acier est moins sensible aux piqûres. La faible teneur en carbone améliore également la résistance à la corrosion intergranulaire et permet une utilisation à des températures plus élevées jusqu'à 450 °C en fonctionnement continu. 1.4404 peut être travaillé à froid et se soude parfaitement. Ce matériau est principalement utilisé dans l'industrie chimique, industries du textile et du papier, et est souvent utilisé dans les appareils, dans l'industrie sanitaire et dans la fabrication de canalisations.

Equivalent Grades of Stainless Steel 1.4404

UE DANS

Etats-Unis –

Allemagne DEPUIS,WNr

Japon IL

France AFNOR

Angleterre BS

Italie Uni

Chine FR

Suède SS

Pologne PN

Tchéquie CSN

Finlande SFS

L'Autriche ONORM

Inter OIN

X2CrNiMo17-12-2 (1.4404)

316L

X2CrNiMo17-13-2

SUS316SUS316L

Z2CND17-12Z3CND17-11-02Z3CND18-12-02

316S11

X2CrNiMo17-12X2CrNiMo17-17-12

00Cr17Ni14Mo20Cr18Ni12Mo2Ti

2348

00H17N13M200H17N14M2

17349

750

X2CrNiMo17-13-2KKW

Type19

SS 1.4404 Chemical Composition(%)

C	Et	Mn	P.	S	Cr	Mo	Dans	N
≤ %	≤ %	≤ %	≤ %	≤ %	%	%	%	≤ %
0,03	1,0	2,0	0,045	0,015	16,5-18,5	2,0-2,5	10,0-13,0	0,11

Propriétés mécaniques 

The values given refer to the diameter range ≤ 160 (Ø in mm) et 160 < d ≤ 250 (Ø in mm)*

Hardness in HB: ≤ 215

Yield strength Rp0.2 in Mpa: ≥ 200

Yield strength Rp1.0 in Mpa: ≥ 235

Strength / tensile strength Rm in Mpa: 500-700

Elongation at break A in % (longitudinal) at ≤ 160: ≥ 40

* These figures refer to mechanical properties at room temperature in the solution-annealed state (according to EN 10088-3)

Propriétés physiques

Density in kg/dm3	8,0
Thermal conductivity at 20°C in W/(m K)	15
Electr. Resistance at 20°C (Ω mm2 /m)	0,75
Specific heat capacity at 20°C (J/kg K)	500

Supplied Forms

Feuille;Bande;Tube;Bar;Tuyau;Plaque;Raccords & Brides;Angle.

Corrosion Resistance

Due to the low carbon content, the material 1.4404 is resistant to intercrystalline corrosion but not sea water resistant. In natural environmental media and moderate concentrations of chlorine and salt, this grade of material has excellent corrosion resistance.

Fabrication

Fabrication of all stainless steels should be done only with tools dedicated to stainless steel materials. Tooling and work surfaces must be thoroughly cleaned before use. These precautions are necessary to avoid cross contamination of stainless steel by easily corroded metals that may discolour the surface of the fabricated product.

Traitement thermique

Cold Working

Grade 316 is readily brake or roll formed into a variety of parts. It is also suited to stamping, heading and drawing but post work annealing is recommended to relieve internal stresses.

Cold working will increase both strength and hardness of 316 acier inoxydable.

Hot Working

All common hot working processes can be performed on 316 acier inoxydable. Hot working should be avoided below 927°C. The ideal temperature range for hot working is 1149-1260°C. Post-work annealing is recommended to ensure optimum corrosion resistance.

Machinability

AISI 316L stainless steel has medium machinability. In direct comparison, the machinability of this stainless steel grade is better than that of AISI 316/1.4401 due to its lower carbon content.

Welding

AISI 316L stainless steel (1.4404 / X2CrNiMo17-12-2) has excellent weldability. The material can be used with all common welding methods (with the exception of gas welding). The addition of a welding filler metal and subsequent heat treatment are not normally required. Resistance to intergranular corrosion is not affected by welding.

Applications

• Pulp and paper equipment;
• Heat exchanger;
• Dyeing equipment;
• Film processing equipment;
• Pipeline;
• Materials for exterior construction in coastal areas;
• Watch bracelet, case, etc.. for advanced watches;
• Equipment for the use of marine, chemicals, dyes, papier, oxalic acid, fertilizer, etc.;
• Food industry;
• Rope;
• CD pole;
• Bolts and nuts;