Nitrogen contained austenitic cast iron in use for beset ring of piston

A technology for austenitic cast iron and ring inserts, which is applied in the field of cast iron materials and cast iron materials for piston insert rings, and can solve the problems of high price and poor wear resistance

Inactive Publication Date: 2007-12-26
SHANDONG BINZHOU BOHAI PISTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The austenitic cast iron material used in the current piston insert is a high-nickel austenitic cast iron material with a nickel content of 13.5-17.5%, which is relatively expensive and has poor wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: The present invention is a nitrogen-containing austenitic cast iron material for a piston insert, the weight percent of its chemical composition is nitrogen 0.01%; carbon 2.4%; silicon 3.0%; manganese 3.6%; nickel 3.2% ; Copper 4.1%; Chromium 2.3%; Phosphorus 0.09%; Sulfur 0.1%;

[0011] The above-mentioned various required alloy ingredients and pig iron are smelted in an electric furnace until they are smelted to about 1500°C to obtain molten iron. After the above-mentioned molten iron is inoculated, it is poured into a rotating centrifugal casting mold, and this is obtained after cooling. Ring casting blanks for cast iron alloys. After further machining, it can be inserted into the piston to achieve the purpose of improving the wear resistance of the first ring groove of the piston.

[0012] The measured mechanical properties of the above-mentioned cast inserts are: tensile strength δ b ≥130MPa, flexural strength δ bb ≥300MPa, Brinell hardness HB120-1...

Embodiment 2

[0013] Embodiment 2: nitrogen 0.1%; carbon 2.9%; silicon 2.4%; manganese 5.2%; nickel 6.4%; copper 5.1%; chromium 1.5%; titanium 0.5%; molybdenum 0.8%; %; phosphorus 0.1%; sulfur 0.08%; the balance is iron. The above-mentioned various required alloy ingredients and pig iron are smelted in an electric furnace until they are smelted to about 1500°C to obtain molten iron. After the above-mentioned molten iron is inoculated, it is poured into a rotating centrifugal casting mold, and this is obtained after cooling. Ring casting blanks for cast iron alloys. After further machining, it can be inserted into the piston to achieve the purpose of improving the wear resistance of the first ring groove of the piston.

[0014] The measured mechanical properties of the above-mentioned cast inserts are: tensile strength δ b ≥130MPa, flexural strength δ bb ≥300MPa, Brinell hardness HB120-170. The metallographic structure is: (1) matrix: an austenite structure with fine alloy carbides and p...

Embodiment 3

[0015] Example 3: nitrogen 0.2%; carbon 3.4%; silicon 3.2%; manganese 8.2%; nickel 12.4%; copper 7.1%; chromium 1.8%; titanium 1.5%; molybdenum 1.8%; %; phosphorus 0.16%; sulfur 0.12%; the balance is iron. The above-mentioned various required alloy ingredients and pig iron are smelted in an electric furnace until they are smelted to about 1500°C to obtain molten iron. After the above-mentioned molten iron is inoculated, it is poured into a rotating centrifugal casting mold, and this is obtained after cooling. Ring casting blanks for cast iron alloys. After further machining, it can be inserted into the piston to achieve the purpose of improving the wear resistance of the first ring groove of the piston.

[0016] The measured mechanical properties of the above-mentioned cast inserts are: tensile strength δ b ≥130MPa, flexural strength δ bb ≥300MPa, Brinell hardness HB120-170. The metallographic structure is: (1) matrix: an austenite structure with fine alloy carbides and ph...

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Abstract

This invention discloses a cast iron material for piston inlay ring, which comprises: N 0.0005-0.2 wt.%, C 2.0-3.6 wt.%, Si 1.1-3.5 wt.%, Mn 2.8-9.0 wt.%, Ni 1.2-13.5 wt.%, Cu 1.1-8 wt.%, Cr 0-2.3 wt.%, Ti 0-2 wt.%, Mo, 0-2 wt.%, V 0-2 wt.%, Zr 0-2 wt.%, Al 0-2 wt.%, P less than or equal to 0.2 wt.%, S less than or equal to 0.2 wt.%, and Fe as balance. The cast iron material is prepared by: mixing the above components, smelting in an electric furnace, incubating, and pouring into a mold to obtain roughcast for casting inlay ring. The tensile strength (deltab), bending strength (deltabb) and Brinell hardness of the cast iron material are greater than or equal to 130 MPa, greater than or equal to 300 MPa and HB 120-170, respectively. The cast iron material has such advantages as low Ni content; lwo cost and high wear resistance, and can satisfy the mechanical property requirements of piston inlay ring of high-performance engine.

Description

technical field [0001] The invention relates to a cast iron material, in particular to a cast iron material used for a piston insert, and belongs to the technical field of cast materials. Background technique [0002] The piston insert is generally made of austenitic cast iron, which can effectively enhance the wear resistance of the first ring groove of the piston and prolong the service life of the piston. At present, this kind of piston insert is widely used in high-performance engines. The quality of the piston ring directly affects the use of the piston and the performance of the entire engine, and the alloy material of the piston ring is the key to its performance. The austenitic cast iron material used in the current piston insert is a high-nickel austenitic cast iron material with a nickel content of 13.5-17.5%, which is relatively expensive and has poor wear resistance. Contents of the invention [0003] Aiming at the deficiency in the mechanical properties of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10F02F5/00
Inventor 张国华冯增建张卫东盖少磊魏作山王培海
Owner SHANDONG BINZHOU BOHAI PISTON
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