Stainless Steel 440 A is stocked by 13 North American distributors and produced by 21 large mills. Distributors will offer small quantity buys while mills will generally only sell large quantities, with delivery times anywhere from 10 to 50 weeks depending on size and form required
This material is stocked primarily in Flat Rolled Products by 7 distributors but is also available to a lesser extent in Bar Products, Wire Products, Tubular Products, Casting Products, and Forging Products.
For distributor (small quantity) availability click here
For mill (large volume) production click here
To view all click here
Specifications
The following specifications cover Stainless Steel 440 A
- AISI 440A
- AMS 5631
- AMS 5632
- ASTM A276
- ASTM A314
- ASTM A473
- ASTM A511
- ASTM A580
- QQ S763
- UNS S44002
Property Results
Chemistry Data : [top]
Carbon
|
|
0.6 - 0.75 |
Chromium
|
|
16 - 18 |
Iron
|
|
Balance |
Manganese
|
|
1 max |
Molybdenum
|
|
0.75 max |
Phosphorus
|
|
0.04 max |
Silicon
|
|
1 max |
Sulphur
|
|
0.03 max |
|
Principal Design Features
|
|
This is a high carbon martensitic stainless with moderate corrosion resistance good strength and the ability to obtain and keep excellent hardness (Rc 56) and wear resistance.
|
|
|
Applications
|
|
Ball bearings and races, gage blocks, molds and dies, cutlery, valve components, knives and measuring instruments.
|
|
|
Machinability
|
|
Best machined in the annealed condition. Tough, stringy chips can be best handled by the use of chip breakers. Carbide or ceramic tooling is recommended.
|
|
|
Welding
|
|
This alloy is not commonly welded due to its tendency to air harden. If it must be welded, preheat to 500 F (260 C) and post weld treat at 1350-1400 F (732-760 C) for 6 hours followed by a slow furnace cooling to avoid cracking. Use similar filler metal and high heat inputs during operations.
|
|
|
Forging
|
|
This alloy is not age
|
|
|
Hot Working
|
|
Pre-heat to 1400 F (760 C), then bring slowly up to 1900-2200 F (1038-1204 C)before proceeding. Do not work this material below 1700 F (927 C). Cool material slowly after working and once at room temperature, anneal fully.****Pre-heat to 1400 F (760 C), then bring slowly up to 1900-2200 F (1038-1204 C) before proceeding. Do not work this material below 1700 F (927 C). Cool material slowly after working and once at room temperature, anneal fully.
|
|
|
Cold Working
|
|
This alloy is considered only slightly cold workable by common practices.
|
|
|
Annealing
|
|
1550-1600 F (843-871 C), followed by very slow furnace cooling.
|
|
|
Tempering
|
|
For maximum properties, soak at 300 F (148 C). Maximum obtainable hardness is RC 56.
|
|
|
Hardening
|
|
Bring the material slowly up to 1400 F (760 C), then on to a soak temperature of 1850 F (1010 C), air or oil cool.
|
|
Physical Data : [top]
|
|
|
Density (lb / cu. in.)
|
0.28
|
|
Specific Gravity
|
7.7
|
|
Specific Heat (Btu/lb/Deg F - [32-212 Deg F])
|
0.11
|
|
Electrical Resistivity (microhm-cm (at 68 Deg F))
|
360
|
|
Melting Point (Deg F)
|
2700
|
|
Modulus of Elasticity Tension
|
29
|
Mechanical Data : [top]
Form |
|
Strip |
Condition |
|
Test Specimen Annealed |
Temper |
|
70 |
Tensile Strength |
|
100 |
Yield Strength |
|
60 |
Elongation |
|
20 |
Rockwell |
|
B95 |
Videos :
|
MSO currently has no videos available for this grade.
|
Disclaimer
This information is provided "as is" and Metal Suppliers Online, Inc. makes no warranty of any kind with respect to the subject matter or accuracy of the information contained herein. Metal Suppliers Online, Inc. specifically disclaims all warranties, expressed, implied or otherwise, including without limitation, all warranties of merchantability and fitness for a particular purpose.
In no event shall Metal Suppliers Online, Inc. be liable for any special, incidental, indirect or consequential damages of any kind or any damages whatsoever resulting from loss of use, data, profits, whether or not advised of the possibility of damage, and on any theory of liability, arising out of or in connection with the use of the information contained herein.
This publication may include technical inaccuracies or typographical errors. Changes may be periodically made to the information herein.
