JPS55122822A - Manufacture inhibiting austenite crystal grain coarsening for controlled rolled steel products - Google Patents

Manufacture inhibiting austenite crystal grain coarsening for controlled rolled steel products

Info

Publication number
JPS55122822A
JPS55122822A JP2951279A JP2951279A JPS55122822A JP S55122822 A JPS55122822 A JP S55122822A JP 2951279 A JP2951279 A JP 2951279A JP 2951279 A JP2951279 A JP 2951279A JP S55122822 A JPS55122822 A JP S55122822A
Authority
JP
Japan
Prior art keywords
austenite
products
steel
grain coarsening
steel products
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2951279A
Other languages
Japanese (ja)
Other versions
JPS6157373B2 (en
Inventor
Soichi Kojima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP2951279A priority Critical patent/JPS55122822A/en
Publication of JPS55122822A publication Critical patent/JPS55122822A/en
Publication of JPS6157373B2 publication Critical patent/JPS6157373B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

PURPOSE: To prevent formation of coarse austenite crystal grains in controlled rolled steel products of case hardening steel or the like, even if they are heat-treated at an austenite zone temp. for carburizing, etc., by subjecting the products to cold plastic working of 20% or more after hot rolling.
CONSTITUTION: Steel products of carbon steel, low alloy steel or the like whose austenite grain growing curve is of suddenly growing type are soaked at 950W 1200°C in a heating furnace to prevent austenite grain coarsening. The products are then hot-rolled at a reduction ratio of 1.5 or more and a finish rolling temp. of 800W950°C followed by cooling at a cooling rate of 0.3W3.0°C/sec, cold plastic working at a working ratio of 20% or more and heat treatment at an austenite zone temp. of 950°C or above without causing austenite grain coarsening. By this method steel products having fine austenite structure are obtd. assuredly.
COPYRIGHT: (C)1980,JPO&Japio
JP2951279A 1979-03-14 1979-03-14 Manufacture inhibiting austenite crystal grain coarsening for controlled rolled steel products Granted JPS55122822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2951279A JPS55122822A (en) 1979-03-14 1979-03-14 Manufacture inhibiting austenite crystal grain coarsening for controlled rolled steel products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2951279A JPS55122822A (en) 1979-03-14 1979-03-14 Manufacture inhibiting austenite crystal grain coarsening for controlled rolled steel products

Publications (2)

Publication Number Publication Date
JPS55122822A true JPS55122822A (en) 1980-09-20
JPS6157373B2 JPS6157373B2 (en) 1986-12-06

Family

ID=12278143

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2951279A Granted JPS55122822A (en) 1979-03-14 1979-03-14 Manufacture inhibiting austenite crystal grain coarsening for controlled rolled steel products

Country Status (1)

Country Link
JP (1) JPS55122822A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852424A (en) * 1981-09-22 1983-03-28 Nippon Steel Corp Manufacture of steel for carburizing at high temperature
JPS6223929A (en) * 1985-07-22 1987-01-31 Daido Steel Co Ltd Manufacture of steel for cold forging

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63184485U (en) * 1987-05-19 1988-11-28

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5041713A (en) * 1973-08-16 1975-04-16

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5041713A (en) * 1973-08-16 1975-04-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852424A (en) * 1981-09-22 1983-03-28 Nippon Steel Corp Manufacture of steel for carburizing at high temperature
JPS6223929A (en) * 1985-07-22 1987-01-31 Daido Steel Co Ltd Manufacture of steel for cold forging

Also Published As

Publication number Publication date
JPS6157373B2 (en) 1986-12-06

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