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Stainless Steel Castings, Grey Iron Castings, Ductile Iron Castings

Alloy Steel Lost Wax Casting Part

Short Description:

Casting Material: Chrome Molybdenum Alloy Steel 20Cr, 35CrMo

Casting Process: Lost Wax Casting

Application: Valve and Pumps


Chrome Molybdenum alloy steel castings by lost wax investment casting. CNC machining, heat treatment and surface treatment are available. Cast alloy steel is usually used when the required strength is high and the use of cast iron cannot meet the requirements. However, the fluidity of molten steel of cast steel is not as good as that of cast iron, so the thickness of the pouring structure should not be too small and the shape should not be too complicated. However, when the silicon content is controlled at the upper limit, the fluidity of molten steel can be improved. 

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Alloy steel castings are very extensive in terms of metal and alloy selection. For example, the cast steel covers a wide range of alloys such as low carbon steel, medium carbon steel, high carbon steel, alloy steel, high alloy steel, stainless steel, duplex stainless steel, precipitation hardening stainless and other special steel alloys.

Steel castings are combination of casting molding process and steel material metallurgy. They can not only have complex structure that are difficult to obtain by other forming processes, but also maintain the unique properties of steel, so the steel casting parts have a high important position in engineering structural materials. In most foundries, steel castings are mainly produced through these several casting processes: lost wax casting, lost foam casting, vacuum casting, sand casting and resin coated sand casting.


Mechanical Properties of Alloy Steel 20Cr and Alloy Steel 35CrMo

Content Mechanical Properties 
20Cr (≥) 35CrMo
sв  (tensile strength), MPa ≥ 835 ≥ 980
sT (yield strength), MPa ≥ 540 ≥ 835
d5 (elogation), ≥ 10 ≥ 12
y (сontraction) ≥ 40 ≥ 45
KCU (impact) , kJ/㎡ ≥ 47 ≥ 63


Performance Characteristics of Alloy Steel Castings

  • • Poor fluidity and volume shrinkage and linear shrinkage are relatively large
  • • Comprehensive mechanical properties are relatively high. Compressive strength and tensile strength are equal
  • • Poor shock absorption and high notch sensitivity
  • • Low carbon steel castings have relatively good weldability.


Structural Characteristics of Alloy Steel Castings

  • • The minimum wall thickness of steel castings should be greater than the minimum wall thickness of gray cast iron. It is not suitable to design too complex castings
  • • Steel castings have relatively large internal stress and are easy to bend and deform
  • • The structure should minimize hot nodes and conditions for sequential solidification should be created
  • • The fillet of the connecting wall and the transition section of different thickness are larger than those of cast iron
  • • Complicated castings can be designed into a casting + welding structure to facilitate casting production




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