Saky Steel produce 440 series hardenable martensitic stainless steel sheets & plates 440A, 440B, 440C
AISI 440A, UNS S44002, JIS SUS440A, W.-nr. 1.4109 ( DIN X70CrMo15 ) stainless steel sheets, plates, flats
AISI 440B, UNS S44003, JIS SUS440B, W.-nr. 1.4112 ( DIN X90CrMoV18 ) stainless steel sheets, plates, flats
AISI 440C, UNS S44004, JIS SUS440C, W.-nr. 1.4125 ( DIN X105CrMo17 ) stainless steel sheets, plates, flats
440A 440B 440C chemical component :
|
Grade |
C |
Si |
Mn |
S |
P |
Cr |
Ni |
Mo |
|
440A |
0.60~0.75 |
≤1 |
≤1 |
≤0.030 |
≤0.040 |
16.00～18.00 |
- |
≤0.75 |
|
440B |
0.85～0.95 |
≤1 |
≤1 |
≤0.030 |
≤0.035 |
16.00～18.00 |
≤0.60 |
≤0.75 |
|
440C |
0.95 – 1.20 |
≤1 |
≤1 |
≤0.030 |
≤0.040 |
16.00～18.00 |
- |
≤0.75 |
The carbon content and hardness of 440A-440B-440C increased successively from A-B-C (A-0.75%, B-0.9%, C-1.2%). The 440C is a very good high-end stainless steel with a hardness of 56-58 RC. These three steels have good rust resistance, 440A is the best, and 440C is the lowest. The 440C is very common. The chemical composition of martensitic stainless steel is characterized by the addition of elements such as molybdenum, tungsten, vanadium, and niobium based on a combination of different components of 0.1%-1.0% C and 12%-27% Cr. Since the tissue structure is a body-centered cubic structure, the strength drops sharply at high temperatures. Below 600 ° C, the high temperature strength is the highest among all types of stainless steel, and the creep strength is also the highest. 440A has excellent quenching and hardening properties and high hardness. It has higher toughness than 440B steel and 440C steel. 440B is used for cutting tools, measuring tools, bearings and valves. It has higher hardness than 440A steel and higher toughness than 440C steel. The 440C has the highest hardness of all stainless steel and heat-resistant steel and is used for nozzles and bearings. 440F is a steel grade that improves the easy-cut properties of 440C steel for automatic lathes.
Post time: Aug-17-2018