Austenitic stainless steels

M30NW

Spécifications

EU
X4CrNiMoN21-9-4
ISO Symbol
X4CrNiMnMo21-9-4
ISO Num
1.4472
BS
BS7252 part 9
ASTM std
F1586

Composition

C
≤ 0.06
Ni
9.5
Cr
21
Mo
2.2
Mn
4
N
0.4

Applications

• Production of permanent surgical implants and devices for osteosynthesis.

Characteristics

• Austenitic stainless steel with excellent corrosion resistance combined with good mechanical properties.
• Rigorous selection of the raw materials used in the steel and the use of consumable electrode remelting guarantee the very high quality required for the production of surgical implants.
• Due to its composition and the absence of ferrite, this steel is totally non‐magnetic and has very good resistance to pitting and crevice corrosion in a physiological medium (Cr % + 3.3Mo % + 15N % > 32).
• Niobium stabilisation results in excellent resistance to intercrystalline corrosion.
• The combination of the melting and processing methods ensures that a homogeneous, finegrained material with a very low level of inclusions is obtained. This results in excellent fatigue resistance which is ideal for the production of parts subject to high stresses.

Mechanical properties

Heat
treatment
UTS
(N/mm²)
0,2%
YS
(N/mm²)
A
(%)
H 860 450 40

Key to heat treatment symbols

Solution treated H Annealed R
Thermo-mechanical treatment TM Quenched and tempered T+RV
Sub-zero treatment F Solution treated and aged H+V

See also

M25W

Austenitic stainless steels