Production of ASTM A487 CA6NM Tube

How to become a professional supplier of ASTM A487 CA6NM Tube in mining equipment? This post will reply you.

ASTM A487 CA6NM is a new type of steel in 1960s, which is represented by American CA6NM steel and Swedish patent 2RM2 steel. Because of the steel has good comprehensive performance, strength and plastic toughness cooperate proper, with excellent forging, casting, welding, and cold working performance, and service performance, such as corrosion resistance, resistant to corrosion, etc.. ASTM A487 CA6NM Tube often used in hydraulic accumulator and iron ore pelletizing industry.

Therefore, in the water and electricity, thermal power, nuclear power, pumps, valves, chemical industry, pressure vessel and all aspects such as military and space applications.

The transformation process of Ca6nm is complex, and the martensite channel transformation and inverse austenite transformation occur in the process from the as-cast state to the final heat treatment.

The transformation of martensite structure is accompanied by volume expansion.

If we can’t understand the phase change rule when casting this kind of steel to produce centrifugal casting steel tube, there will be a risk of casting deformation and cracking in the casting and heat treatment process, especially the selection of several key components in the chemical composition is also extremely important.

Therefore, we have carried out a systematic experimental study on the phase transition rule, casting and heat treatment characteristics and properties of the steel, obtained some regulative results. The results have been applied to the production of centrifugal cast steel tubes and obtained expected results.

In year 2015 we received an order from a customer who are an international well-known European and American mining equipment company to produce ASTM A743 CA6NM steel tube for iron ore pelletizing industry. The customer is global leaders in mining equipment industry. And their requirements for products are seriously strict. From the purchase of raw materials, production, testing to the completion of delivery we strictly control the quality.

Meantime to keep improving we overcome a series of problems encountered in the production process and completed the contract in time. Through the inspection by the third party inspection agency SGS the products are all conformed the standard of ASTM A743 CA6NM. Thereby we are recognized by the customer.

Since then, our company has been designated as the exclusive supplier of CA6NM steel tube by the customer. And the supply has continued up to now. By April 2021, the cumulative supply is close to 10000 pcs of tube. And the qualified rate is more than 99%. We are trusted by the customer and established a solid business relationship with each other.

In January 2018, a well-known iron mining equipment manufacturer from the Middle East visited our foundry for CA6NM tube. They were very satisfied with our production process and products quality. We have manufactured nearly 1000 finished rolls for this customer. And we become the long-term supplier and created solid business relationship with each other.

Through these years of production we accumulated rich experience of ASTM A487 CA6NM tube production. From steel melting, centrifugal casting and subsequent heat treatment the process tends to be perfect. Eventually we become a professional supplier of CA6NM steel tube. At the same time we have supplied products for European, Western Asian and North American customers.

ASTM A487 CA6NM tube specification sheet

Specification table for pipes used in mining machinery

ASTM A487 CA6NM tube are being centrifugal cast


  • What is the maximum weight and maximum size of the centrifugal cast steel pipe in your company?
    • Maximum weight: 5000KG
    • Maximum length: 6500mm
  • What is the minimum lead time?
  • What is the delivery status of your centrifugal cast steel tubes?
  • What are the most common finished goods delivered in your company?

CA6NM stainless steel pipe

CA6NM stainless steel pipe not only has good corrosion resistance, weldability, but also has high strength and low temperature toughness . It belongs to low carbon martensite stainless steel, mainly used for hydropower facilities and mine facilities of the wear parts. Such as turbine blades, turbine, roller screen/feeder.
Not only to undergo general corrosion medium, but also to endure the erosion of the sediment, cavitation erosion at runtime. Poor use conditions.


Compare CA6NM and 17-4 ph.  CA6NM stainless steel pipe has higher strength, hardness, resistance to cavitation erosion, also keep good toughness and fatigue resistance, underwater and has better weldability

CA6NM Heat treatment
 CA6NM Heat treatment      

Not only has good corrosion resistance, weldability, but also has high strength and low temperature toughness .

CA6NM Stainless steel
CA6NM Stainless steel pipe
  • The casting of  stainless steel  has many advantages in application Its advantages are as follows:
    1. High strength and high toughness Rp0.2 > 600 MPa Rm > 800 MPa A > 18% Z > 50% A kv > 100 j.
    2 Good low temperature impact properties, fracture toughness and FATT (Brittle transition temperature of -173 ~ -196 ℃).
    3. Good welding yao casting and machining performance.
    4. Good underwater fatigue resistance and cavitation erosion and wear resistance.
    5. High harden ability and good mechanical properties, with heavy section.
    6. CA6NM stainless steel castings good engineering nondestructive testing performance.
  • But CA6NM stainless steel  has its prominent shortcomings and engineering practice. Must solve the key technical problems of its shortcomings as follows,
  • 1.The sensitivity of the composition and microstructure deviation.
    2.Heat treatment process control and the sensitivity of the mechanical properties change.


    CA6NM microstructure
    CA6NM microstructure

    3.The phase change process and the complexity of the stress control.

  • 4.It’s easy to have a cold crack defects.

Through the optimization process. We produce CA6NM tube, meeting with ASTM A743 and Astm487, and exported to North America. The microstructure of 100% martensite.



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