316L stainless steel 1.4404 (NE 31603)

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

1.4404 is an acid-resisting austenitic stainless steel with 17% Cr, 12% Ni and 2,0% Mo.. Due to its Mo content, this material has a significantly improved corrosion resistance compared to stainless steels. 1.4404 is resistant to reducing action of organic and inorganic acids as well as against halogen-containing media. În plus, this steel is less susceptible to pitting. The low carbon content also improves the resistance to intergranular corrosion and allows use at higher temperatures up to 450 ° C in continuous operation. 1.4404 can be cold worked and weld excellent. This material is mainly used in the chemical, textile and paper industries, and is often used in apparatus, in sanitary industry and in pipe fabrication.

Equivalent Grades of Stainless Steel 1.4404

UE ÎN

STATELE UNITE ALE AMERICII –

Germania DIN,Face

Japonia EL

Franţa Afnor

Anglia BS

Italia Uni

China GB

Suedia SS

Polonia PN

Cehia CSN

Finlanda SFS

Austria Onorm

Inter ISO

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 Compoziție chimică(%)

C.	Si	MN	P	S	Cr	Mo.	În	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

Proprietăți mecanice 

The values given refer to the diameter range ≤ 160 (Ø in mm) şi 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)

Physical Properties

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

Foaie;Bandă;Tub;Bar;Țeavă;Placă;Fitinguri & Flanges;Angle.

Rezistență la coroziune

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

Fabricarea tuturor oțelurilor inoxidabile trebuie făcută numai cu instrumente dedicate materialelor din oțel inoxidabil. Suprafețele de scule și de lucru trebuie curățate bine înainte de utilizare. Aceste precauții sunt necesare pentru a evita contaminarea încrucișată a oțelului inoxidabil prin metale ușor corodate care pot decolora suprafața produsului fabricat.

Tratament termic

Cold Working

Grad 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 oţel inoxidabil.

Lucrare la cald

All common hot working processes can be performed on 316 oţel inoxidabil. 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.

Machinabilitatea

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.

Sudare

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, paper, oxalic acid, fertilizer, etc.;
• Food industry;
• Rope;
• CD pole;
• Bolts and nuts;