JPH03183739A - Manufacture of high toughness non-heat treated steel for hot forging, its bar steel - Google Patents

Manufacture of high toughness non-heat treated steel for hot forging, its bar steel

Info

Publication number
JPH03183739A
JPH03183739A JP32341589A JP32341589A JPH03183739A JP H03183739 A JPH03183739 A JP H03183739A JP 32341589 A JP32341589 A JP 32341589A JP 32341589 A JP32341589 A JP 32341589A JP H03183739 A JPH03183739 A JP H03183739A
Authority
JP
Japan
Prior art keywords
steel
temp
heat treated
bar
bar steel
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
JP32341589A
Other languages
Japanese (ja)
Other versions
JPH0762204B2 (en
Inventor
Hirotada Takada
Yoshiro Koyasu
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
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP1323415A priority Critical patent/JPH0762204B2/en
Publication of JPH03183739A publication Critical patent/JPH03183739A/en
Publication of JPH0762204B2 publication Critical patent/JPH0762204B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To obtain the non-heat treated steel and bar steel for hot forging having excellent strength and toughness, at the time of subjecting a molten steel contg. specified amounts of Mn, Cr, V and Ti to continuous casting, by regulating its cooling in a specified temp. range, executing casting and thereafter directly rolling the steel into a bar steel.
CONSTITUTION: A steel constituted of, by weight, 0.20 to 0.60% C, 0.10 to 2.00% Si, 0.50 to 2.00% Mn, 0.10 to 1.20% Cr, 0.03 to 0.20% V, 0.005 to 0.070% Ti, <0.005% Al, 0.0010 to 0.0100% O, 0.005 to 0.020% N and the balance Fe with inevitable impurities is subjected to continuous casting. The casting is executed under the condition that ≥20°C/min cooling rate is regulated in the temp. range from its solidifying temp. to 1000°C. After that, the steel is directly rolled into a bar steel without executing blooming. The bar steel is heated to about ≤1270°C and is forged into machine parts. After that, the machine parts are cooled in the temp. range of about 800 to 400°C at 0.1 to 5.0°C/sec average. The bar steel has excellent impact properties as hot-forged state and is useful as a non-heat treated steel for hot forging.
COPYRIGHT: (C)1991,JPO&Japio
JP1323415A 1989-12-13 1989-12-13 Manufacturing method of high-toughness non-heat treated steel for hot forging and its steel bars and parts Expired - Lifetime JPH0762204B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1323415A JPH0762204B2 (en) 1989-12-13 1989-12-13 Manufacturing method of high-toughness non-heat treated steel for hot forging and its steel bars and parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1323415A JPH0762204B2 (en) 1989-12-13 1989-12-13 Manufacturing method of high-toughness non-heat treated steel for hot forging and its steel bars and parts

Publications (2)

Publication Number Publication Date
JPH03183739A true JPH03183739A (en) 1991-08-09
JPH0762204B2 JPH0762204B2 (en) 1995-07-05

Family

ID=18154443

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1323415A Expired - Lifetime JPH0762204B2 (en) 1989-12-13 1989-12-13 Manufacturing method of high-toughness non-heat treated steel for hot forging and its steel bars and parts

Country Status (1)

Country Link
JP (1) JPH0762204B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020053670A (en) * 2000-12-27 2002-07-05 이계안 A alloy steel for automobile knuckle and preparing method thereof
US7670444B2 (en) * 2001-03-21 2010-03-02 Daido Steel Co., Ltd. Non-heat treated steel for hot forging with easy fracture splitting
JP2010270346A (en) * 2009-05-19 2010-12-02 Jfe Bars & Shapes Corp Non-heat treated steel for hot-forging, having high bending fatigue strength and small amount of deformation due to repeating stress, and method for manufacturing parts of the same
CN107747059A (en) * 2017-11-30 2018-03-02 攀钢集团攀枝花钢铁研究院有限公司 Steel wire rod and its production method are built containing V, Ti, Cr microalloy
CN110144525A (en) * 2019-06-04 2019-08-20 甘肃酒钢集团宏兴钢铁股份有限公司 520Mpa grades of photovoltaic brackets low alloy hot rolling thin steel strip and its CSP technique production method
CN114293093A (en) * 2021-11-17 2022-04-08 攀钢集团攀枝花钢铁研究院有限公司 600 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62207821A (en) * 1986-03-10 1987-09-12 Sumitomo Metal Ind Ltd Production of unnormalized steel for hot forging
JPS62253725A (en) * 1986-04-28 1987-11-05 Nippon Steel Corp Production of high-toughness non-heattreated bar steel for hot forging

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62207821A (en) * 1986-03-10 1987-09-12 Sumitomo Metal Ind Ltd Production of unnormalized steel for hot forging
JPS62253725A (en) * 1986-04-28 1987-11-05 Nippon Steel Corp Production of high-toughness non-heattreated bar steel for hot forging

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020053670A (en) * 2000-12-27 2002-07-05 이계안 A alloy steel for automobile knuckle and preparing method thereof
US7670444B2 (en) * 2001-03-21 2010-03-02 Daido Steel Co., Ltd. Non-heat treated steel for hot forging with easy fracture splitting
JP2010270346A (en) * 2009-05-19 2010-12-02 Jfe Bars & Shapes Corp Non-heat treated steel for hot-forging, having high bending fatigue strength and small amount of deformation due to repeating stress, and method for manufacturing parts of the same
CN107747059A (en) * 2017-11-30 2018-03-02 攀钢集团攀枝花钢铁研究院有限公司 Steel wire rod and its production method are built containing V, Ti, Cr microalloy
CN110144525A (en) * 2019-06-04 2019-08-20 甘肃酒钢集团宏兴钢铁股份有限公司 520Mpa grades of photovoltaic brackets low alloy hot rolling thin steel strip and its CSP technique production method
CN114293093A (en) * 2021-11-17 2022-04-08 攀钢集团攀枝花钢铁研究院有限公司 600 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method thereof
CN114293093B (en) * 2021-11-17 2022-12-23 攀钢集团攀枝花钢铁研究院有限公司 600 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method thereof

Also Published As

Publication number Publication date
JPH0762204B2 (en) 1995-07-05

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