Martensitic Stainless Steels

Martensitic Stainless Steels

Martensitic stainless steels are the first branch of the plain chromium stainless steels.

The common grades are 410, 416, 420/420C, 431 and 440C these are all alloys containing iron, chromium (12% to 18%) and carbon (up to 1%). These steels are able to be hardened by way of a quench and temper heat treatment process and capable of high levels of strength and hardness.

The basic characteristics of martensitic stainless steels are that they have low resistance too high and low temperature, moderate corrosion resistance. Are magnetic with low ductility along with a medium work hardening rate. Can be welded providing correct procedures are followed but commonly used in machining applications.

Typical applications for the use of Martensitic stainless steels include Knife blades, domestic cutlery, surgical instruments, special fasteners, turbines, impellers, valve bodies and chemical engineering equipment. Most commonly supplied in bar form with options of sheet, plate and coil predominantly in Grade 420/420C for blade manufacture.

Grade and Typical application:

410 – General purpose used for nuts, bolts, bushings, pump and valve parts in mildly corrosive environments.

416 – Free machining variation of 410 used in the same applications.

420 – General use, pump shafts and valve assemblies.

420C – Created to obtain high hardness after heat treatment for tooling and Blade manufacture.

431 – Hardenable steel with corrosion resistance close to 304, ideal for pump shafts, beater bars and marine hardware applications.

440C – Highest hardness and abrasion resistance of all the stainless steels used in valve seats, surgical equipment and bearings.

Welding

Grade
X134/EL
EN #
1.4313
AISI #
-
UNS #
S41500
EN Name
X3CRNIM013-4
AWS Class.
-

Precipitation Hardening

These steels with a minimum of 10.5% Cr have exceptional strength due to heat treatment at various temperatures that induces precipitation hardening (also known as aging). This process allows a sub microscopic precipitation of phase rich in elements coherent with the matrix (for example Cu ) that greatly increases the mechanical properties of the steel.

Grade
V157M
EN #
1.4574
AISI #
632
UNS #
S15700
EN Name
-
Grade
V145
EN #
-
AISI #
XM-25
UNS #
S45000
EN Name
-
Grade
V145/1
EN #
1.4594
AISI #
-
UNS #
-
EN Name
X5CRNIM0CUNB14-5
Grade
V155
EN #
1.4545
AISI #
XM-12
UNS #
S15500
EN Name
-
Grade
V174
EN #
1.4542
AISI #
630
UNS #
S17400
EN Name
X5CRNICUNB16-4
Grade
V174/1
EN #
1.4548
AISI #
630
UNS #
S17400
EN Name
X5CRNICUNB17-4-4
Grade
V174LC*
EN #
1.4542
AISI #
630
UNS #
S17400
EN Name
X5CRNICUNB16-4
Grade
V176T
EN #
-
AISI #
635
UNS #
S17600
EN Name
-
* For load cells or higher Rp02/Rm ratio.

Grades

Grade
CMXA
EN #
-
AISI #
440A
UNS #
S44002
EN Name
-
BS #
-
Grade
CMXB
EN #
-
AISI #
440B
UNS #
S44003
EN Name
-
BS #
-
Grade
CMXBM
EN #
1.4112
AISI #
-
UNS #
-
EN Name
X90CRM0V18
BS #
-
Grade
CMXC
EN #
1.4125
AISI #
440C
UNS #
S44004
EN Name
X105CRM017
BS #
-
Grade
CMXC/1
EN #
-
AISI #
440C
UNS #
S44004
EN Name
-
BS #
-
Grade
CMX/DE
EN #
1.4037
AISI #
-
UNS #
-
EN Name
X65CR13
BS #
-
Grade
VAL1
EN #
1.4006/1.4011
AISI #
403/410
UNS #
S40300/S41000
EN Name
X12CR13/X12CR12
BS #
410S21
Grade
VAL1AL/2
EN #
1.4002
AISI #
405
UNS #
S40500
EN Name
X6CRAL13
BS #
-
Grade
VAL1B/DE
EN #
1.4024
AISI #
-
UNS #
-
EN Name
X15CR13
BS #
-
Grade
VAL1HS
EN #
1.4005
AISI #
416
UNS #
S41600
EN Name
X12CRS13
BS #
416S21
Grade
VAL1PT
EN #
1.4512
AISI #
409
UNS #
S40900
EN Name
X2CRTI12
BS #
-
Grade
VAL1Z
EN #
1.4005
AISI #
416
UNS #
S41600
EN Name
X12CRS13
BS #
416S21
Grade
VAL2A
EN #
1.4021
AISI #
420
UNS #
S42000
EN Name
X20CR13
BS #
-
Grade
VAL2AM
EN #
1.4120
AISI #
-
UNS #
-
EN Name
X20CRM013
BS #
-
Grade
VAL2A/UK
EN #
-
AISI #
-
UNS #
-
EN Name
-
BS #
420S29
Grade
VAL2A/UK2
EN #
-
AISI #
-
UNS #
-
EN Name
-
BS #
420S37
Grade
VAL2B
EN #
1.4028
AISI #
420
UNS #
S42000
EN Name
X30CR13
BS #
420S45
Grade
VAL2C
EN #
1.4031
AISI #
420
UNS #
S42000
EN Name
X39CR13
BS #
-
Grade
VAL2CZ
EN #
1.4035
AISI #
-
UNS #
-
EN Name
X45CRS13
BS #
-
Grade
VAL2D
EN #
1.4116
AISI #
-
UNS #
-
EN Name
X50CRM0V15
BS #
-
Grade
VAL2/DE
EN #
1.4034
AISI #
-
UNS #
-
EN Name
X46CR13
BS #
-
Grade
VAL2/DS
EN #
1.4036
AISI #
-
UNS #
-
EN Name
X46CRS13
BS #
-
Grade
VAL2BZ
EN #
1.4029
AISI #
420F
UNS #
S42020
EN Name
X29CRS13
BS #
-
Grade
VAL3
EN #
1.4122
AISI #
-
UNS #
-
EN Name
X39CRM017-1
BS #
-
Grade
VAL3S
EN #
1.4122
AISI #
-
UNS #
-
EN Name
X35CRM017
BS #
-
Grade
VAL4
EN #
1.4057
AISI #
431
UNS #
S43100
EN Name
X17CRNI16-2
BS #
-
Grade
VAL4/UK
EN #
-
AISI #
-
UNS #
-
EN Name
-
BS #
431S29
Grade
X134M
EN #
1.4313
AISI #
-
UNS #
S41500
EN Name
X3CRNIM013-4
BS #
-
Grade
X134M/1
EN #
1.4313/1.4413
AISI #
-
UNS #
S41500
EN Name
X3CRNIM013-4/X4CRNIM013-4
BS #
-
Grade
X134M/3
EN #
-
AISI #
-
UNS #
S41500
EN Name
-
BS #
-
Grade
X164M
EN #
1.4418
AISI #
-
UNS #
-
EN Name
X4CRNIM016-5-1
BS #
-