1.4057
Data sheet material 1.4057 / AISI 431
X17CrNi16-2
Martensitic corrosion-resistant chromium steel
Brief description
Due to its nickel content, the material 1.4057 or AISI 431 has better toughness and corrosion resistance than comparable 13% chromium steels. Due to its high strength, resistance and good running properties, this material is often used for machine parts subject to heavy loads, such as pumps, valves, piston rods and compressor impellers.
Standards and nomenclature
| EN | |
|---|---|
| DIN | X17CrNi16-2 |
| AISI | 431 |
| US | S43100 |
| EN | |
|---|---|
| DIN | X17CrNi16-2 |
| AISI | 431 |
| US | S43100 |
Chemical composition
| C (carbon) | 0,12 | 0,22 |
| Mn (manganese) | - | 1,5 |
| Si (silicon) | - | 1,0 |
| P (phosphorus) | - | 0,040 |
| S (sulphur) | - | 0,030 |
| Cr (chromium) | 15,0 | 17,0 |
| Ni (nickel) | 1,5 | 2,5 |
| N (nitrogen) | - | - |
-
-
min.
max.
C
(carbon)
0,12
0,22
Mn
(Manganese)
-
1,5
Si
(Silicon)
-
1,0
P
(phosphorus)
-
0,040
S
(sulphur)
-
0,030
Cr
(chrome)
15,0
17,0
Ni
(nickel)
1,5
2,5
N
(Nitrogen)
-
-
General
Properties
| Corrosion resistance | |
|---|---|
| Mechanical properties | good |
| Forgeability | medium |
| Weldability | good |
| Machinability | bad |
Special
Properties
High-gloss polishable
Can be used from -40°C to 400°C
Corrosion
Consistency
Maximum corrosion resistance is achieved with a bright metallic surface. Due to the formation of chromium carbides and the associated chromium depletion in certain areas, this material is susceptible to intercrystalline corrosion. (PREN = 17.5 - 21.2)
Mechanical properties
at 20°C
Hardness
HB
≤ 295
Yield point
Rp0,2
N / mm²
≥ 515
Tensile strength
Rm
N / mm²
800 - 950
Elongation
A5,65
≥ 14%
Modulus of elasticity
kN / mm²
215
Forgeability
The forging process initially involves slow heating to over 850°C. This is followed by faster heating to temperatures of 1150°C - 1180°C in order to forge in a temperature range of 1180°C - 950°C. This is followed by slow cooling. This is followed by slow cooling.
Weldability
This material can be welded if certain precautions are taken - in the tempered and annealed condition. The material must be heated to 100°C - 300°C before welding. During welding, cooling below 200°C should be avoided. Gas containing hydrogen or nitrogen should also be avoided, as this has a negative effect on the mechanical properties.
To ensure adequate corrosion resistance of the weld seam, it is imperative that tempering colours are removed chemically or mechanically.
Machinability
Machinability depends on hardness and strength and is similar to structural steels of the same hardness.
Markets & Applications
Automotive industry
Chemical and petrochemical industry
Power plant construction
Aviation industry
Mechanical engineering
Physical properties
at 20°C
Density
kg/dm³
7,0
Electrical
Resistance
(ohm) mm²/m
0,70
Magnetisability
available
Thermal conductivity
W/m K
25
Specific
Heat capacity
J/kg K
460
Processing
| Cold forming | |
|---|---|
| Cold heading | not usual |
| Polishability | Yes |
| Open-die and closed-die forging | rare |
| Machining | Yes |
Thermal treatment
| Soft annealing (+A) | |
|---|---|
| Hardening (+QT) | 950 - 1050°C (cooling: oil, polymer, air) |
| Tempering | 600 - 800°C (cooling: water, air) |
| Hot forming | 800 - 1100°C (cooling: slowly in the oven) |
| Soft annealing (+A) | |
|---|---|
| Hardening (+QT) | 950 - 1050°C (cooling: oil, polymer, air) |
| Tempering | 600 - 800°C (cooling: water, air) |
| Hot forming | 800 - 1100°C (cooling: slowly in the oven) |
Frequently asked questions
Important note
TEAM EDELSTAHL operates purely as a trading company without technical staff. As a result, we cannot and must not provide materials consulting.
The above values and information on the properties and/or usability of the material are purely informative. This information is based on the experience of the manufacturer and TEAM EDELSTAHL. All information is without guarantee. Misprints, errors and changes excepted.
