US2017130304A1PendingUtilityA1

Alloy with High Core Hardness Suitable for Rapid Nitriding

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Assignee: CATERPILLAR INCPriority: Nov 5, 2015Filed: Nov 5, 2015Published: May 11, 2017
Est. expiryNov 5, 2035(~9.3 yrs left)· nominal 20-yr term from priority
Inventors:Zachary S. BirkyRobert L. MeyerRobert Bierman
C21D 8/10C21D 8/02C21D 8/00C21D 9/0081C21D 9/46C21D 8/0247C21D 8/0257C21D 9/08C21D 8/0221C22C 38/02C22C 38/34C21D 8/0205C22C 38/38C22C 38/04C22C 38/24C22C 38/06C23C 8/26C21D 8/105C21D 8/005C23C 8/02
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Claims

Abstract

The disclosure is directed to an alloy steel suitable for rapid nitriding, having a steel composition including by weight (%): Carbon: from 0.2 to 0.4; Manganese: from 0.50 to 1.60; Silicon: from 0.50 to 2.0; Chromium: from 0.40 to 1.5; Vanadium: from 0.03 to 0.30; Aluminum: from 0.07 to 0.30; and a balance of iron and other residual elements, where amounts of nickel and molybdenum are limited.

Claims

exact text as granted — not AI-modified
We claim: 
     
         1 . An alloy steel suitable for rapid nitriding, having a steel composition comprising by weight (%):
 Carbon: from 0.2 to 0.4;   Manganese: from 0.50 to 1.60;   Silicon: from 0.50 to 2.0;   Chromium: from 0.40 to 1.5;   Vanadium: from 0.03 to 0.30;   Aluminum: from 0.07 to 0.30; and   Iron and other residual elements: balance.   
     
     
         2 . The alloy steel suitable for rapid nitriding according to  claim 1 , wherein the silicon content in the steel composition is in range of from 1.0 to 2.0% by weight. 
     
     
         3 . The alloy steel suitable for rapid nitriding according to  claim 1 , wherein the silicon content in the steel composition is in a range of from 1.5 to 2.0% by weight. 
     
     
         4 . The alloy steel suitable for rapid nitriding according to  claim 1 , wherein the steel composition further comprises by weight:
 Nickel: 1.0% or less.   
     
     
         5 . The alloy steel suitable for rapid nitriding according to  claim 1 , wherein the steel composition further comprises by weight:
 Molybdenum: 0.1% or less.   
     
     
         6 . The alloy steel suitable for rapid nitriding according to  claim 1 , wherein the steel composition further comprises by weight:
 a total amount of nickel and molybdenum: 1.0% or less.   
     
     
         7 . The alloy steel suitable for rapid nitriding according to  claim 1 , wherein the steel composition further comprises by weight:
 at least one of titanium and niobium: 0.1% or less.   
     
     
         8 . The alloy steel suitable for rapid nitriding according to  claim 1 , wherein the steel composition consists essentially of by weight (%):
 Carbon: from 0.2 to 0.4;   Manganese: from 0.50 to 1.60;   Silicon: from 0.50 to 2.0;   Chromium: from 0.40 to 1.5;   Vanadium: from 0.03 to 0.30;   Aluminum: from 0.07 to 0.30; and   Iron and impurities: balance.   
     
     
         9 . A steel product made of the alloy steel suitable for rapid nitriding according to  claim 1 , wherein the alloy steel is hot-forged at a temperature in a range of about 1100 to 1250° C. 
     
     
         10 . A steel product made of the alloy steel suitable for rapid nitriding according to  claim 1 , wherein the alloy steel is tempered at a temperature in a range of about from 200° C. to 650° C. 
     
     
         11 . A steel product made of the alloy suitable for rapid nitriding according to  claim 1 , wherein the steel product is any of pipes, hot-rolled plates, rolled round bars, forgings, round bars, square bars, flat bars, and plates. 
     
     
         12 . A method for manufacturing a steel product made of an alloy steel suitable for rapid nitriding, comprising:
 hot deforming the steel alloy to obtain the steel product;   heat-treating the hot deformed steel product;   tempering the heat-treated steel product; and   rapidly nitriding the tempered steel product,   wherein the alloy steel has a steel composition comprising: by weight(%)
 Carbon: from 0.2 to 0.4; 
 Manganese: from 0.50 to 1.60; 
 Silicon: from 0.50 to 2.0; 
 Chromium: from 0.40 to 1.5; 
 Vanadium: from 0.03 to 0.30; 
 Aluminum: from 0.07 to 0.30; and 
 Iron and other residual elements: balance. 
   
     
     
         13 . The method according to  claim 12 , wherein the silicon content in the steel composition is in range of from 1.0 to 2.0% by weight. 
     
     
         14 . The method according to  claim 12 , wherein the silicon content in the steel composition is in a range of from 1.5 to 2.0% by weight. 
     
     
         15 . The method according to  claim 12 , wherein the steel composition further comprises by weight:
 Nickel: 1.0% or less.   
     
     
         16 . The method according to  claim 12 , wherein the steel composition further comprises by weight:
 a total amount of nickel and molybdenum: 1.0% or less.   
     
     
         17 . The method according to  claim 12 , wherein the steel composition consists essentially of by weight (%):
 Carbon: from 0.2 to 0.4;   Manganese: from 0.50 to 1.60;   Silicon: from 0.50 to 2.0;   Chromium: from 0.40 to 1.5;   Vanadium: from 0.03 to 0.30;   Aluminum: from 0.07 to 0.30; and   ron and impurities: balance.   
     
     
         18 . The method according to  claim 12 , wherein the heat-treated steel product is tempered at a temperature in a range of about from 200° C. to 650° C. 
     
     
         19 . The method according to  claim 12 , wherein the rapidly nitriding further comprises nitriding the steel product at a temperature in a range of 400 to 600° C. 
     
     
         20 . The method according to  claim 12 , wherein the alloy steel is hot-forged at a temperature in a range of about 1100 to 1250° C.

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