CA6nm martensitic stainless-steel overview

Martensitic stainless steel CA6NM is a steel grade developed based on traditional martensitic stainless steel by reducing carbon content and increasing nickel and molybdenum content. This steel has high tensile strength, good ductility, improved weldability, good corrosion resistance and machinability, and low economic cost. The typical matrix metal microstructure of super martensitic stainless steel is tempered martensite, which has high strength and toughness. After martensitic stainless steel is quenched and tempered at a certain temperature, part of the martensite will undergo reverse transformation to form reversed austenite. This reversed austenite has high thermal stability and is dispersed in the low-carbon lath martensite matrix, which optimizes the properties of the material.

The characteristics of martensitic stainless steel CA6NM

  • High strength and hardness
  • Good corrosion resistance in certain environments
  • Good formability and weldability
  • Low-temperature toughness
  • Magnetic properties.
  • Due to its good toughness, Ca6nm can be used in the temperature range of -60°C to +300°C.
    Good corrosion resistance in moderately corrosive environments without chlorides.

Chemical Composition

  • Carbon:                                   0.06% Max
  • Manganese:                           1.00% Max
  • Silicon:                                     1.00% Max
  • Phosphorus:                           0.04% Max
  • Sulfur:                                       0.03% Max
  • Chromium:                        11.50 – 14.00%
  • Nickel:                                     3.50 – 4.50%
  • Molybdenum:                        0.40 – 1.00%

Physical Properties

  • Yield Strength:                       80 ksi Min
  • Tensile Strength:                 110 ksi Min
  • Elongation at 2 in:                    15% Min
  • Reduction of Area:                   35% Min

CA6NM Related standards

CA6NM Applications

Application of Ca6nm in ocean

Ca6nm is used in aerospace, bearings, bushings, chemical and food processing equipment, food processing equipment, medical equipment, impellers, tableware, pump and valve components, and turbine engine parts industries. It enables engineers to create more efficient products that can withstand extreme conditions to meet customer demands. Furthermore, the level of performance offered by these materials is not only cost-effective, but also allows for greater versatility in design.

CA6NM material equivalent

ASTMA182 Grade F6NM
BS1504 Grade 425C11
GB/T 6967 Grade ZG04Crl3Ni5Mo
EN 10088-1 Grade X3CrNiMol3-4 (EN 1.4313)
EN 10283 Grade GX4CrNil3-4 (EN 1.4317)
EN 10250 Grade X3CrNiMol3-4 (EN 1.4313)
AFNOR NFA35-573 Grade Z6CN13-04
AISI 415, SAE 415

CA6NM Heat Treatment Requirements:

The CA6NM heat treatment process is an important part of ensuring the quality and durability of metal components. It involves heating the metal to a precise temperature for a specific amount of time, which alters its molecular structure and makes it more resistant to wear and tear. This process is especially important for parts that will be used in high-stress environments, such as aerospace or automotive applications.

The alloy is hardened by heating between 1900 and 1950°F (1038 to 1066°C) followed by cooling in either air or oil. It is important to temper the castings after they have cooled down to a temperature lower than the martensite finish temperature, which changes depending on their composition. Tempering should be done as soon as possible for the best results.

Tempering is an important step in the production of castings. It involves cooling the casting to a temperature lower than its martensite finish temperature, which varies depending on its composition. This process increases the strength and ductility of the casting, making it more durable and resistant to wear and tear. Temperatures used for tempering vary depending on the type of alloy used in the casting but generally range from 400°F to 650°F. Tempering is necessary for creating high-quality castings that can withstand the rigors of their intended use.

Depending on strength requirements, the alloy is tempered at 600°F (316°C) or more commonly in the range of 1100 to 1150°F (593 to 621°C). Tempering in the vicinity of 900°F (482°C) should be avoided because lower toughness will result. Some re-austenitization may occur if tempering temperatures above 1200°F (649°C) are employed, and upon cooling, the microstructure may contain untempered martensite.

Double tempering is an effective way of improving the hardness levels of steel castings for use in hostile environments, such as those containing hydrogen sulfide (H2S). By tempering the steel twice, it is possible to achieve lower hardness levels than would be possible with a single tempering process. This allows for increased resistance to corrosion and wears in H2S environments, making double tempering an ideal solution for high-quality steel castings.