AISI 4140 alloy steel Products With Moderate Hardenability
Article    Author    View144     Time2022-05-17

  At Songshun Steel, we have more than ten years of industry experience in the production of AISI 4140 alloy steel products. Over the years, we have accumulated rich professional knowledge on medium hardenability steel and alloy steel. This paper mainly analyzes and researches AISI 4140 alloy steel products belonging to medium hardenability steels.

AISI 4140 alloy steel

What is medium hardenability steel? What is AISI 4140 alloy steel?
  Hardenability refers to the material characteristics characterized by the depth of the hardened layer and the hardness distribution of the sample under specified conditions, and it mainly depends on the critical quenching cooling rate of the material.The properties that determine the depth of hardening and the distribution of hardness in steel under specified conditions. That is, the ability to obtain the depth of the hardened layer when the steel is quenched, which indicates the ability of the steel to accept quenching.The greater the depth of the hardened layer of the steel, the better the hardenability of the steel. The hardenability of steel is good or bad, which is often expressed by the depth of the hardened layer.The greater the depth of the hardened layer, the better the hardenability of the steel. The hardenability of steel mainly depends on its chemical composition, especially the alloying elements and grain size that increase the hardenability, heating temperature and holding time and other factors. Therefore, medium hardenability steel refers to steel with a medium depth of hardened layer;
  AISI 4140 alloy steel belongs to medium hardenability steel. It is an alloy structural steel with high yield, good comprehensive mechanical properties, good strength, good toughness and high hardenability. Its carbon content is 0.33%-0.48 %, the tensile strength is 795 MPa, and the hardness is 241HB, which can be used to make steam turbine fasteners, fishing tools, etc.

Study on Chemical Composition of AISI 4140 Alloy Steel

AISI 4140 Alloy Steel Chemical Composition

C

Si

Mn

Cr

Mo

S

P

Ni

Cu

0.38-

0.45

0.17-

0.37

0.50-

0.80

0.90-1.20

0.15-

0.25

0.035

0.035

0.30

0.30

  Carbon is the element with the most obvious solid solution strengthening effect in alloy steel 4140 steel, 4140 steel is molybdenum steel, indicating that it has higher molybdenum content compared with other steels, AISI 4140 alloy structural steel, the performance is similar to 4135, due to the increased Therefore, the strength and hardenability are better than 4135 steel after quenching and tempering, and the sulfur, phosphorus and silicon content of 4140 steel and 4340 steel are equal.

Production and processing technology of AISI 4140 alloy steel
  AISI 4140 alloy steel is made by placing iron, carbon, and other alloying elements in an electric or oxygen furnace.The iron, carbon, and other alloying elements are mixed together in liquid form and then cooled, and the steel can then be annealed. After annealing is complete, the steel is heated again to the molten state so that it can be cast into the desired shape.At the same time, hot working and cold working can also be carried out by some tools to achieve the required thickness.
  Heat treatment standard: quenching 850, oil cooling; tempering 560, water cooling, oil cooling; metallographic structure: tempered sorbite.

AISI 4140 Alloy Steel It is an excellent material which is widely used in many industries due to its excellent toughness, wear resistance, impact resistance and high fatigue strength.At Songshun Steel, we provide customers with AISI 4140 alloy steel products, which highlight our advantages in alloy steel products, and have won unanimous praise from global cooperative customers, the quality of the product, and its versatility And practicality has been repurchased by many customers, you are welcome to contact us anytime to inquire about alloy steel products.

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