1.4112 – AISI 440B is designed to provide stainless properties with excellent hardness. In some respects it behaves similary to tool steel. 1.4112 – AISI 440B resists corrosion from mild atmospheres, fresh water steam, ammonia, many petroleum products and organic materials and several mild acid environments.


  1. In August 2018, we made a batch of 1.4112 martensite stainless steel sleeves for Vietnamese customers.

2.The difficulty lies in the machining wall thickness of 10mm and the drilling of 64 holes. Through the special machining process.The difficulty of j9ag of thin-walled pipe is overcome and the requirements of drawings are successfully met.Through solid solution treatment, the hardness reaches HRC55 and the matrix is martensite which has good strength.

1.4112 Martensitic Stainless Steel Sleeves
1.4112 Martensitic Stainless Steel Sleeves
  1. This is our new customer. Within two weeks of communication, the customer recognized our professionalism and price and placed the sample order.This is a good start, showing our company “through sincere cooperation with customers to establish sincere friendship” customer development concept.
  2. Two martensitic stainless steel sleeves were made for customers this time:




  1. It is widely used in various industries, such as aerospace, electricity, petrochemical, shipping, machinery, electronics, environmental protection and also used as stainless steel blade, mechanical cutting tool and operating knife.Can also do forging, bar, plate, strip, ring, silk, flange and other production according to customer requirements.


 Heat treatment:




Soft  annealing



600-650℃    furnace


  Stress relief annealing


1000-1050℃Oil,pressure gas,air or hot bath 500-550See tempering diagram










Eternal Bliss Alloy Casting & Forging Co.,LTD.

technical department