What is 1.4057 material equivalent to ASTM?
What is 1.4057 SS material?
ASTM 431, or 1.4057 stainless steel, is the comprehensive martensite grade for engineering applications. The exact composition varies, but an exemplary 1.4057 stainless steel will comprise: 15–17% chromium; 2–2.5% nickel; and 0.12–0.22% carbon. It may also include small volumes of molybdenum, silicon, and phosphorus. It can be processed into various practical product forms, including sheets, coils, tubes, bars, and wires.
What is 1.4057 material equivalent to ASTM?
The direct equivalent material for X17CrNi16-2 is AISI 431 (USA), which is also known as UNS S43100. Other equivalent grades include EN 1.4057, JIS SUS431, and BS 431S29.
| European Union | US | ISO | China | Japan | |||||
| Standard | Designation (Material Number) | Standard | Grade (UNS) | Standard | Grade (ISO number ) | Standard | Name (Code) | Standard | Grade |
| EN 10088-2; EN 10088-3; EN 10088-1 |
X17CrNi16-2 (1.4057) | AISI; ASTM A240/A240M; ASTM A276/A276M; ASTM A959 |
AISI 431 (UNS S43100) |
ISO 15510 | X17CrNi16-2 (4057-431-00-X) | GB/T 1220; GB/T 3280 |
17Cr16Ni2 (S43120) | JIS G4303; JIS G4304 |
SUS431 |
|
431 (1.4057) Chemical Composition |
|||||||
| Grade | C | Mn | P | S | Si | Cr | Ni |
| 431 (1.4057) | 0.12 - 0.20 | 1.0 max | 0.04 max | 0.03 max | 1.0 max | 15.0 - 18.0 | 2.0 - 3.0 |
Mechanical properties of 431, UNS S43100, S80, X17CRNI16-2, and 1.4057 martensitic stainless steels
| Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Brinell (HB) | Impact Charpy V (J) |
|---|---|---|---|---|---|
| Annealed * | 862 | 655 | 20 | 285 max | – |
| 204 | 1345 | 1055 | 20 | 388 | 50 |
| 316 | 1295 | 1035 | 19 | 375 | 53 |
| 427 | 1350 | 1080 | 19 | 388 | # |
| 538 | 1140 | 965 | 19 | 321 | # |
| 593 | 1015 | 770 | 20 | 293 | 64 |
| 650 | 960 | 695 | 20 | 277 | 84 |
Physical properties of 431, UNS S43100, S80, X17CRNI16-2, and 1.4057 martensitic stainless steels
| Grade | kg/m³ | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | °C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
|---|---|---|---|---|---|---|---|---|---|
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 431 | 7800 | 200 | 10.2 | 12.1 | - | 20.2 | - | 460 | 720 |
Corrosion resistance of the material
As a chromium-nickel steel, the material AISI 431 (1.4057, BS 431S29, X17CrNi16-2) has good corrosion resistance. However, the material is susceptible to intergranular corrosion. Maximum corrosion resistance is achieved with a bright metallic surface.
1.4057 material hardness
The hardness of 1.4057 stainless steel varies with heat treatment, ranging from approximately 295 HB (Brinell Hardness) in the annealed state to 33-46 HRC (Rockwell Hardness) after quenching and tempering. The specific hardness depends on the heat treatment, such as the QT800 or QT900 conditions, and can also be influenced by cold work during processing.
1.4057 Martensitic Stainless Steel Machining
431, UNS S43100, S80, X17CrNi16-2, and 1.4057 martensitic stainless steels are easily machinable in the annealed state. However, if the hardness of these steels exceeds 30 HRC, machining them becomes extremely difficult.
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