CA6NM equivalent grades, properties & application
CA6NM ASTM A743 is a kind of low carbon martensitic stainless steel. It has good mechanical properties and has many equivalent grades
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CA6NM stainless steel is a kind of low carbon martensitic stainless steel. It has good mechanical properties, static fracture toughness, and underwater fatigue performance of large section, and also has good cavitation resistance and welding performance. It is an excellent material for turbine and pump parts.CA6NM equiivalent grades, heat treatment, properties & applications are as following
CA6NM Equivalent
CA6NM equivalent grades are as following
| Material Grade | CA6NM(ASTM Standards) |
| DIN Standards | DIN 1.4313, DIN X4CrNi13-4 |
| AFNOR Standards | AFNOR Z6CN13-04 |
| BS Standards | BS 425C11 |
| AISI Standards | AISI 415 |
| SAE Standards | SAE 415 |
| JIS Standards | JIS SUSF6NM |
| BS-EN Standards | EN X3CrNiMo13-4, EN GX5CrNi134, EN 1.4313 |
| ASTM Standards | ASTM F6NM |
| UNS Standards | UNS J91540, UNS S41500 |
| CA6NM equivalent of forging | |
| Standard | QJ/SK05-06-2004 |
| Brand | 0Cr13Ni4Mo |
| CA6NM equivalent of casting | |
| Standard | JB/T10384-2002 |
| Brand | ZG06Cr16Ni5Mo |
Heat treatment
The steel is mainly quenched and tempered and has different heat treatment processes according to different performance requirements.
The following are typical heat treatment processes：
Annealing 590-640℃
Conditioning 1000-1050℃ normalizing
600-620℃ tempering
CA6NM Stainless Steel Application
This steel is generally used for parts with severe cavitation and high requirements for comprehensive mechanical properties, such as runner blades, upper crown, lower ring, leak stop ring, and wear plate in the turbine. In pump products, it is mainly used to make pump impeller with high anti-cavitation performance or feedwater pump shaft with high mechanical performance. At the same time, it can also be used to manufacture various important parts bearing impact and high load, such as connectors and fasteners.
Chemical properties and physical properties
Thermal Properties
Melting range：1400-1500℃
Thermal conductivity λ= 0.06-0.065 W/m℃
Specific heat capacity C=460J/kg·℃
Coefficient of linear expansion
|
θ（℃） |
100 |
600 |
1000 |
|
а（10-6/℃） |
10.0 |
10.5 |
12.0 |
CA6NM density： ρ= 7.74-7.75kg/m3
Specific resistance
|
θ（℃） |
20 |
100 |
|
Ω·mm2/m |
0.55 |
0.65-0.70 |
Magnetic properties
Martensitic stainless steel with strong ferromagnetism.
Chemical properties
Oxidation resistance: the steel has excellent oxidation resistance.
Corrosion resistance: it has good corrosion resistance to general corrosive media (such as brine, nitric acid and some organic acids with low concentration) at room temperature,。
Underwater fatigue property： σ – 1 = 260-300 MPa
Elastic properties
Elastic modulus at room temperature E=200Gpa
Fracture properties K1C=390MN/m3/2
CA6NM Process performance
Hot working performance: forging temperature range 1050-1150 ℃, final forging temperature greater than 850 ℃.
Weldability
The weldability of the steel is good, the hardening tendency of HAZ is small and the stress is small. However, as cast, welding is strictly prohibited
Repair welding and cutting riser and other thermal process operations. After 600-650 softening annealing treatment, the castings shall be repaired or welded before quenching and tempering.
Technology
CA6NM STAINLESS STEEL TECHNOLOGY
Cutting and grinding
CA6NM stainless steel has high strength and toughness after heat treatment, so it has good machinability and grindability.
Casting technology
CA6NM stainless steel has excellent casting properties, and it is not easy to produce cracks during solidification and shrinkage. However, reasonable design of gating and riser system should be paid attention to.
