US2020173001A1PendingUtilityA1

Low-alloy heat-resistant steel having high reheat-cracking resistance

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Assignee: UNIV WUHANPriority: Nov 30, 2018Filed: Apr 17, 2019Published: Jun 4, 2020
Est. expiryNov 30, 2038(~12.3 yrs left)· nominal 20-yr term from priority
Inventors:Xue Hui WangYong LiJian-Xin LiHuachun YangShiyu JingCaiying Xia
C22C 38/48C22C 38/002C22C 38/04C22C 38/06C22C 38/46C22C 38/44C22C 38/001C22C 38/50C22C 38/54C22C 38/02
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Claims

Abstract

Steel, including the following element ratios (in mass percent amounts): carbon (C): 0.04-0.11%; silicon (Si): 0.50% or less; manganese (Mn): 0.10-0.60%; phosphorus (P): 0.03% or less; sulphur (S): 0.01% or less; nicide (Ni): 0.40% or less; chromium (Cr): 1.90-2.60%; vanadium (V): 0.20-0.30%; niobium (Nb): 0.02-0.08%; molybdenum (Mo): 0.05-0.30%; tungsten (W): 1.45-1.75%; titanium (Ti): 0.01-0.06%; boron (B): 0.001-0.012%; aluminum (Al): 0.03% or less; nitrogen (N): 0.01% or less; the balance being iron (Fe) and impurities. The contents of C and B satisfy the following inequality: (% B) −1.2×(% C)2+0.30×(% C)−0.01.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . Steel, comprising the following element ratios in mass percent amounts: carbon (C): 0.04-0.11%; silicon (Si): 0.50% or less; manganese (Mn): 0.10-0.60%; phosphorus (P): 0.03% or less; sulphur (5): 0.01% or less; nickle (Ni): 0.40% or less; chromium (Cr): 1.90-2.60%; vanadium (V): 0.20-0.30%; niobium (Nb): 0.02-0.08%; molybdenum (Mo): 0.05-0.30%; tungsten (W): 1.45-1.75%; titanium (Ti): 0.01-0.06%; boron (B): 0.001-0.012%; aluminum (Al): 0.03% or less; and nitrogen (N): 0.01% or less, the balance being iron (Fe) and impurities; wherein the contents of C and B, in mass percent amounts, satisfy the following inequality:
   (%  B )>−1.2×(%  C ) 2 +0.30×(%  C )−0.01.
   
     
     
         2 . The steel of  claim 1 , content of C in the steel is 0.04-0.08%. 
     
     
         3 . The steel of  claim 1 , wherein a content of B in the steel is 0.004-0.01%. 
     
     
         4 . The steel of  claim 1 . wherein a content ofB in the steel is 0.006-0.01%. 
     
     
         5 . The steel of  claim 1 . wherein the contents of C and B satisfy the following inequality:
   (%  B )>−1.4×(%  C ) 2 +0.35×(%  C )−0.0115.
   
     
     
         6 . The steel of  claim 2 , wherein the content of B in the steel is 0.004-0.01%. 
     
     
         7 . The steel of  claim 2 , wherein the content of B in the steel is 0.004-0.008%. 
     
     
         8 . The steel of  claim 1 , wherein a content of C in the steel is 0.04-0.08%, and the contents of C and B satisfy the following inequality:
   (%  B )>−1.4(%  C ) 2 +0.35×(%  C )−0.0115.
   
     
     
         9 . The steel of  claim 8 , wherein the content of B in the steel is 0.004-0.01%. 
     
     
         10 . The steel of  claim 8 , wherein the content of B in the steel is 0.006-0.01%.

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