Stainless martensitic • precipitation hardening steel • stainless ferritic — Our answer to your needs
Martensitic stainless steels ( quoted from ISSF )
In 400 series family, it contains nonhardenable ferritic stainless steels (0.02 to 0.06% carbon, 10.5 to 30% chromium,
0 to 4% molybdenum. Commonly used internally, these grades are now being developed for envelope and structural products. Applications including Car exhaust systems, conveyor chains, cooking utensils, boilers domestic electrical appliances, domestic appliances, trim, dishware, heating, hot water tanks, tubes.. )
and martensitic stainless steels ( typically contain 12 to 17% chromium and nickel in a range from 0 to 5%.
The lower nickel content offers the secondary advantage of a lower material cost. Martensitic stainless steels, like
other stainless steel families, provide a long, low maintenance product life, and it benefits from an excellent recycling rate. )
martensitic stainless steels contains more than 10.5% chromium and their mechanical properities can be adjusted by
heat treatment, just like engineering steels.
They fall into 4 groups.
1. Fe-Cr-C steels, they are the first grades put into use and still widely used in engineering and in wear resistant applications.
2. Ni-bearing grades, in which Ni replaces some of the C, compared to the previous group, they offer a higher
toughness particularly at low temperatures.
Their higher Cr content leads to a higher corrosion resistance.
Mo additions in groups 1 and 2 improve further the corrosion resistance.
3. Precipitation hardening stainless steels, offer the best combination of strength and toughness.
4. Creep resisting grades, with about 11% Cr, differe from group 1 by addition of Co, Nb, V and B which increases of
high temperature strength and creep resistance up to 650℃.
|Group 1||Group 2||Group 3||Group 4|
ASTM 410, 420
EN 1.4006, 1.4021, 1.4028, 1.4031, 1.4034
2. wear resistant
ASTM 440A, 440B, 440C
EN 1.4109, 1.4112, 1.4125
C 0.20 max
ASTM 431, F6NM, S165M
EN 1.4057, 1.4313, 1.4418
C 0.1 max
ASTM 630, 631
17-4PH, 17-7PH, 15-5PH
EN 1.4542, 1.4568, 1.4545, 1.4534, 1.4594, 1.4596
With Co, Nb, V, B, additions
1.4913, 1.4922, 1.4923
Martensitic stainless' special characteristics:
1. high mechanical properities
2. high hardness and wear resistance
3. good creep resistance of the Co/V/Nb/W/B grades
4. higher stiffness
5. moderate to good corrosion resistance
7. thermal conductivity
8. thermal expansion coefficient
9. improved machinability grades
Oil and gas
oil drilling, mud motors, manufactured from EN 1.4542, AISI 630, 17-4PH precipitation hardening stainless steel.
martensitic stainless steels are suitable for sweet ( CO2) environments, under which standard carbon and low alloy
steels would suffer localized corrosion also called mesa or ringworm corrosion.
While 13Cr% ( Type EN 1.4016, DIN X12Cr13, AISI 410 ) was almost the only martensitic grade used years ago,
now new martensitic grades, usually referred to a super martensitic S13Cr and S17Cr are increasingly used as they
bridge the gap of performance between 13Cr and Duplex materials by providing a larger application domin with regards
to temperatures, H2S content and chloride concentration.
high strength martensitic stainless steels and particularly grades EN 1.4542, AISI 630 are commonly used in aerospace,
in a wide variety of applications, of which hydraulic systems, landing gear, shafts, actuators, fasteners..
pump bodies, impellers and shafts, valve bodies, stems etc.. pipe fittings, extruders in the food industry, bolts,
Cutlery and cutting tools
well known uses of stainless martensitic steels, typical grades EN 1.4021, DIN X20Cr13, AISI 420A, EN 1.4028,
DIN X30Cr13, AISI 420B, EN 1.4031, DIN X39Cr13, AISI 420X, EN 1.4034, DIN X46Cr13, AISI 420C, EN 1.4122,
DIN X39CrMo17-1, EN 1.4116, DIN X50CrMoV15, EN 1.4037, DIN X65Cr13, EN 1.4109, DIN X70CrMo15,
AISI 440A, EN 1.4125, DIN X105CrMo17, AISI 440C
Brake discs, stainless steel grade AISI 420
Moulds for glass bottles
stainless steel grade EN 1.4057, DIN X17CrNi16-2, AISI 431, DIN 1.2787
Moulds for plastic injection
AISI 420, EN 1.4031, DIN X39Cr13 or EN 1.4122, DIN X35CrMo17