What is UNS S42000 stainless steel?
UNS S42000 refers to AISI 420 stainless steel, a hardenable, martensitic stainless steel with high carbon content. It is known for its high hardness and strength, and is used in applications like pumps, valves, knives, and structural components where wear resistance is important. This steel can be heat-treated to achieve a hardness of up to HRC 51 minimum.
Grade comparisons of grade 420 stainless steels
|
Grade |
UNS No |
Old British |
Euronorm |
Swedish SS |
Japanese JIS |
||
|
BS |
En |
No |
Name |
||||
|
420 |
S42000 |
420S37 |
56C |
1.4021 |
X20Cr13 |
2303 |
SUS 420J1 |
Compositional ranges of grade 420 stainless steels
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
|
|
420 |
min. max. |
0.15 - |
- 1 |
- 1 |
- 0.040 |
- 0.03 |
12.0 14.0 |
Mechanical properties of grade 420 stainless steels
|
Tempering Temperature (°C) |
Tensile Strength (MPa) |
Yield Strength |
Elongation (% in 50mm) |
Hardness Brinell (HB) |
Impact Charpy V (J) |
|
Annealed * |
655 |
345 |
25 |
241 max |
- |
|
204 |
1600 |
1360 |
12 |
444 |
20 |
|
316 |
1580 |
1365 |
14 |
444 |
19 |
|
427 |
1620 |
1420 |
10 |
461 |
# |
|
538 |
1305 |
1095 |
15 |
375 |
# |
|
593 |
1035 |
810 |
18 |
302 |
22 |
|
650 |
895 |
680 |
20 |
262 |
42 |
|
* Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum. |
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Physical properties of annealed grade 420 stainless steels
|
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion |
Thermal Conductivity |
Specific Heat 0-100°C |
Electrical Resistivity (nΩ.m) |
|||
|
0-100°C |
0-315°C |
0-538°C |
at 100°C |
at 500°C |
|||||
|
420 |
7800 |
200 |
10.3 |
10.8 |
11.7 |
24.9 |
- |
460 |
550 |
Is 420 stainless steel corrosion resistant?
420 stainless steel is a martensitic higher carbon version of types 410 and 416 stainless that can be hardened by heat treatment. It contains a minimum of 12 percent chromium, sufficient to give 420 corrosion resistance properties.
Can 420 stainless steel be used in acidic water environments (pH=1)?
No, 420 stainless steel cannot be used in acidic water environments with a pH of 1. Acids with a pH below 2 will attack the protective oxide layer on the steel, leading to corrosion. While 420 stainless steel is resistant to mild acids (pH 5.5 and above), a solution with a pH of 1 is considered highly aggressive and will cause the steel to corrode.
How magnetic is 420 stainless steel?
The magnetic properties of AISI 420 martensitic stainless steel samples were determined under various processing conditions. In the annealed state the material has a high magnetization saturation (σs=180.2 A2m/kg), low coercive force (MHc=3.87 Oe) and low residual magnetization (Mr=0.25 A2m/kg).
What is the difference between 420 and 420F stainless steel?
The main difference is that 420F stainless steel is a free-machining version of 420 stainless steel, created by adding sulfur to dramatically improve its machinability. While standard 420 steel is known for its hardness and corrosion resistance, 420F sacrifices a small amount of its corrosion resistance to allow for easier, faster machining, making it ideal for applications with complex, machined parts like dental instruments, cutlery, and bolts.
Gnee produces 420 stainless steel in a variety of shapes, including plates, bars, tubes, strips and wires. These shapes are suitable for different processing and manufacturing needs, providing flexible application options. We support various customization services such as hot working, cold working, annealing, welding, surface treatment, etc. Welcome to contact us!
