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Martensitic stainless steel rod for automobile turbocharger rivet

A martensitic stainless steel and turbocharger technology, applied in the field of stainless steel bars, can solve the problems of large fluctuations in quenching hardness and depth of hardened layer, low qualification rate, etc.

Inactive Publication Date: 2019-01-08
BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a martensitic stainless steel bar for automobile turbocharger rivets, which solves the problems of large fluctuations in surface induction hardening hardness and hardened layer depth and low pass rate of existing steel types

Method used

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  • Martensitic stainless steel rod for automobile turbocharger rivet

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Embodiment 1

[0034] The chemical composition is: C: 0.12%, Si: 0.1%, Mn: 0.1%, P: 0.02%, S: 0.02%, Cr: 15.00%, Ni: 1.50%, N: 0.01%, B: 0.0001%, I The amount is Fe and unavoidable impurities. Vacuum induction melting or non-vacuum melting is used to cast steel ingots according to the above-mentioned composition ratio. The steel ingots are demoulded after 24 hours. The heating temperature of the steel ingots is 1100°C and the heating time is 80 minutes. After the steel ingots are heated, they are forged. ℃, the forging specification is 85mm×85mm billet, after forging, the billet is bundled and stacked together for cooling; the surface of the billet is peeled with a grinding wheel, and the surface oxide scale and defects are removed, and the peeling depth is 1-3mm; the peeled billet Put it into the heating furnace for heating, the steel ingot heating temperature is 1120°C, and the heating time is 60min; after the billet is heated, it is rolled, the starting rolling temperature is 1050°C, the ...

Embodiment 2

[0036] The chemical composition is: C: 0.13%, Si: 0.2%, Mn: 0.2%, P: 0.025%, S: 0.022%, Cr: 15.5%, Ni: 1.60%, N: 0.015%, B: 0.0001%, I The amount is Fe and unavoidable impurities. Vacuum induction melting or non-vacuum melting is adopted according to the above-mentioned composition ratio, and the steel ingot is cast. The steel ingot is demoulded after 24 hours. The heating temperature of the steel ingot is 1120°C, and the heating time is 90 minutes. After the steel ingot is heated, it is forged. ℃, the forging specification is 85mm×85mm billet, after forging, the billet is bundled and stacked together for cooling; the surface of the billet is peeled with a grinding wheel, and the surface oxide scale and defects are removed, and the peeling depth is 1-3mm; the peeled billet Put it into the heating furnace for heating, the steel ingot heating temperature is 1150°C, and the heating time is 80min; after the billet is heated, it is rolled, the starting rolling temperature is 1050°C...

Embodiment 3

[0038] The chemical composition is: C: 0.15%, Si: 0.2%, Mn: 0.3%, P: 0.012%, S: 0.015%, Cr: 15.5%, Ni: 2.50%, N: 0.05%, B: 0.0005%, I The amount is Fe and unavoidable impurities. Vacuum induction melting or non-vacuum melting is used according to the above-mentioned composition ratio, and the steel ingot is cast. The steel ingot is demoulded after 24 hours. The heating temperature of the steel ingot is 1150°C, and the heating time is 90 minutes. After the steel ingot is heated, it is forged. ℃, the forging specification is 85mm×85mm billet, after forging, the billet is bundled and stacked together for cooling; the surface of the billet is peeled with a grinding wheel, and the surface oxide scale and defects are removed, and the peeling depth is 1-3mm; the peeled billet Put it into the heating furnace for heating, the steel ingot heating temperature is 1100°C, and the heating time is 80min; after the billet is heated, it is rolled, the starting rolling temperature is 1050°C, th...

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Abstract

The invention discloses a martensitic stainless steel rod for an automobile turbocharger rivet and belongs to the technical field of stainless steel rods. The martensitic stainless steel rod comprisesthe following chemical elements in percentage by mass: 0.12-0.22% of C, less than or equal to 1.00% of Si, less than or equal to 1.50% of Mn, less than or equal to 0.04% of P, less than or equal to 0.03% of S, 15.00-17.00% of Cr, 1.50-2.50% of Ni, 0.01-0.30% of N, 0.0001-0.0010% of B and the balance of Fe and inevitable impurities. The martensitic stainless steel rod has the advantages that deltaferrite caused in surface sensitive quenching of an automobile turbocharger rivet can be avoided, the problems of large rivet surface sensitive quenching hardness and hardening layer depth fluctuation and low pass percentages in the prior art can be solved, and the rivet sensitive quenching property pass percentage can be up to 98% or greater.

Description

technical field [0001] The invention belongs to the technical field of stainless steel rods, in particular to a martensitic stainless steel rod for automobile turbocharger rivets. In particular, it relates to a martensitic stainless steel rod for automobile turbocharger rivets and a manufacturing method thereof. Background technique [0002] Automobile turbocharger rivets are used for riveting the connecting cover on the supercharger, and they are subjected to friction, shear and impact during service, so high surface hardness (440~540HV) and low internal hardness (≤330HV) are required, namely It has a gradient hardness of "hard on the outside and tough on the inside". The high hardness on the surface is for wear resistance, and the high toughness inside is for shear and impact resistance. In order to meet the above requirements, low-carbon martensitic stainless steel bars are used at home and abroad to process rivets, and then the rivets are subjected to surface induction ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/54C21D8/06C21D1/26
CPCC22C38/02C21D1/26C21D8/065C21D2211/008C22C38/001C22C38/04C22C38/54
Inventor 文新理章清泉李振瑞张荣刘海稳柳海波冮名震陈晓光王超吴会云魏然
Owner BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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