X2CrNiMo 17-12-2 - Schmolz + Bickenbach AG

C: max. 0,03
Mn: 2,0
Cr: 16,5 - 18,5
Ni: 10,5 - 12,0
Mo: 2,0 - 2,5
1.4404
Stainless austenitic, chromium nickel molybdenum
steel with low carbon content
Relevant current and obsolete standards:
EN 10088-3 : 1.4404 X2CrNiMo 17-12-2
AISI : 316 L
UNS : S 31603
BS : 316 S 11
JIS : SUS 316 L
AFNOR : Z3CND17-11-02/
Z3CND 17-12-02
DIN 17440 : 1.4404
SIS : 2347 and 2348
Special grades for particular applications
fine wire grade
extreme fine wire grade
cold heading grade: DIN EN 10263-5
improved machining grade: NIRO-CUT 4404
drawing grade
General properties
corrosion resistance : very good
mechanical properties : average
forgeability : good
weldability : excellent
machinability : average
Special properties
non-magnetic grade (r 1,3)
suited to cryogenic applications
Suitable for use up to 700°C
Physical Properties
density (kg/dm 3 ) : 7,98
electrical resistivity
at 20°C ( mm 2 /m) : 0,75
magnetisability : slight
thermal conductivity
at 20°C (W/m K) : 15
specific heat capacity
at 20°C (J/kg K) : 500
thermal expansion
(10 -6 K -1 ) between
20 and 100°C : 16,0
20 and 200°C : 16,5
20 and 300°C : 17,0
20 and 400°C : 17,5
20 and 500°C : 18,0
Typical applications
1.4404
X2CrNiMo 17-12-2
automotive industry
construction industry
chemical industry
decorative applications and kitchen fittings
food and beverage industries
mechanical engineering
aerospace applications
medical and pharmaceutical applications
Hint - additional information on the machi
nability of this grade of stainless steel can
be found in the brochure entitled NIRO-
CUT .
- available from stock
- supplied in accordance with the Z-30.
3-6 building regulation
Processing properties
automated machining : yes
machinable : yes
hammer and die forging : yes
cold forming : yes
cold heading : yes
suited to polishing : yes
Finished product forms and conditions
wire rod
peeled bars 20 - 80
bright bar h9, 2 – 80
black bar 20 – 80
bright coils h9, 0,8 - 20
solution annealed and quenched
direct quenched
pickled
drawn
straightened
peeled
ground
Demand tendency
Revision No. 4404-0
Created: 7.04.2000

Properties, applications and processing
Corrosion resistance (PRE = 23.1 to 28.5)
Due to the addition of between 2 and 3% molybdenum,
the corrosion resistance of 1.4404 is
significantly better than that of 1.4301 and
1.4307, especially in chloride containing environments.
1.4404 displays excellent resistance to corrosion
in most natural waters and atmospheres (urban,
rural and industrial), provided the chloride and
salt concentrations are low to moderate. Resistance
to reducing acids is restricted to low concentrations
at low temperatures.
Due to its low carbon content, 1.4404 is resistant
to intergranular corrosion even after welding.
Please note that 1.4404 is not resistant to sea
water.
Heat treatment / mechanical properties
Optimal mechanical and fabrication properties
are realised after solution annealing in the temperature
range 1020 - 1120°C followed by rapid
cooling in air or water.
In the solution annealed condition, the following
mechanical properties may be attained when
testing in the longitudinal direction:
Property Specification Typical
- yield strength (N/mm 2 ) Rp0,2 : 200 360
- tensile strength (N/mm 2 ) Rm : 500 – 700 660
- tensile elongation (%) A5 : 40 48
- hardness HB : 215 200
- impact energy (J) @ 25°C ISO-V : 100 220
Elevated temperature properties
The following minimum tensile properties at various
temperatures are specified in the EN 10088-
3 : 1995 standard.
Minimum proof stress (N/mm 2 )
250
225
200
175
150
125
100
75
0
100
0.2% proof stress
200
1% proof stress
300
Test temperature ( C)
400
500
600
Weldability
1.4404 is readily weldable using all welding processes.
Should a filler material be
required, Novonit 4430, can be used. Maximum
interpass temperature during welding is
150°C.
Heat treatment after welding is not necessary,
and even large sections are resistant to intercrystalline
corrosion after welding, due to the low
carbon content.
Forging
Work pieces are usually pre-heated to between
1150 - 1180°C with forging taking place between
1180 und 950°C. After forging, the forged component
must be rapidly cooled in either air or
water to avoid the formation of any undesirable
phases which might adversely affect the corrosion
and/or mechanical properties.
Machining
The machinability of NIRO-CUT 4404 is better
than that of NIRO-CUT 4401 as a result of its
lower carbon content. The absence of titanium
stabilisation also makes 1.4404 far more machinable
than the titanium stabilised 1.4571 grade.
The following machining parameters can be used
as a guideline when machining NIRO-CUT 4404
using a coated hard metal cutting tool.
Depth of cut (mm)
Tensile strengths
Feed rate (mm/rev)
Rm in N/mm 2 6 mm 3 mm 1 mm
0,5 mm/r 0,4 mm/r 0,2 mm/r
solution annealed
(550 - 620) 135 m/min 170 m/min 215 m/min
General comments
Due to advances in the production of stainless
steels, namely reduction of the carbon content to
very low levels, 1.4404 has all but replaced the
titanium stabilised 1.4571 grades. 1.4404 is just
as resistant to intercrystalline corrosion as the
titanium grades and does not suffer from knifeline
corrosion. 1.4404 also has a much better
surface finish that the titanium stabilised grade
and can be readily mechanically and electropolished.
Due to the absence of titanium additions
and the resulting hard precipitates, 1.4307
is much more machinable than 1.4541 which
allows higher cutting speeds and results in longer
tool life.
Revision No. 4404-0
Created: 7.04.2000