KR970043169A

KR970043169A - Manufacturing method of high strength steel pipe type automobile door reinforcement having excellent low temperature toughness

Info

Publication number: KR970043169A
Application number: KR1019950053575A
Authority: KR
Inventors: 김기호; 박성호
Original assignee: 김종진; 포항종합제철 주식회사
Priority date: 1995-12-21
Filing date: 1995-12-21
Publication date: 1997-07-26

Abstract

본 발명은 강관형 자동차문 보강재의 제조방법에 관한 것으로, 강의 합금성분계, 열연조건 및 열처리조건들을 적절히 제어함에 의해 인장강도 120kg/㎟ 이상의 고강도를 확보함과 동시에 저온에서의 충격인성이 우수한 강관형 자동차문 보강재의 제조방법을 제공하고자 하는데 고 목적이 있다. 상기한 목적을 달성하기 위한 발명은 중량%로, C:0.1-0.2%, Si:0.5%이하, Mn:1.0-1.8%, P:0.025%이하, S:0.010% 이하, Al:0.02-0.10%, Cr:0.1-0.5%, Ti:0.05% 이하, B:0.0015-0.0050%, Ni:0.50-1.50%, 나머지:Fe 및 불가피한 불순물로 조성되는 강을 열간압하여 850-900℃의 온도범위에서 마무리하고 수냉하여 권취한 다음, 이를 조관하여 자동차문 보강재를 성형한 후 900-950℃의 온도범위로 가열한 후 수냉하고 200-300℃의 온도범위에서 소려하여 저온인성이 우수한 고강도 강관형 자동차문 보강재의 제조방법에 관한 것을 그 요지로 한다.The present invention relates to a method for manufacturing a steel pipe-type automobile door reinforcement, by securing the high strength of the tensile strength of 120kg / ㎜ or more by appropriately controlling the alloy composition system, hot rolling conditions and heat treatment conditions of the steel and at the same time excellent in toughness at low temperatures The purpose is to provide a method of manufacturing a car door reinforcement. The invention for achieving the above object is by weight, C: 0.1-0.2%, Si: 0.5% or less, Mn: 1.0-1.8%, P: 0.025% or less, S: 0.010% or less, Al: 0.02-0.10 %, Cr: 0.1-0.5%, Ti: 0.05% or less, B: 0.0015-0.0050%, Ni: 0.50-1.50%, remainder: Hot-pressurized steel composed of Fe and unavoidable impurities High temperature steel tube type car with excellent low temperature toughness after cooling in water temperature and temperature range of 200-300 ℃ It relates to a method of manufacturing a door reinforcement.

Description

Manufacturing method of high strength steel pipe type automobile door reinforcement having excellent low temperature toughness

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 열처리전 Ni첨가량에 따른 충격흡수에너지의 변화를 나타내는 그래프,2 is a graph showing the change in impact absorption energy according to the amount of Ni added before heat treatment,

제3도는 열처리후 Ni첨가량에 따른 충격흡수에너지의 변화를 나타내는 그래프.3 is a graph showing the change in impact absorption energy according to the amount of Ni added after the heat treatment.

Claims

By weight%, C: 0.1-0.2%, Si: 0.5% or less, Mn: 1.0-1.8%, P: 0.025% or less, S: 0.010% or less, Al: 0.02-0.10%, Cr: 0.1-0.5%, Ti: 0.05% or less, B: 0.0015-0.0050%, Ni: 0.50-1.50%, remaining: Fe and the steel composed of inevitable impurities are hot-pressed to finish in the temperature range of 850-900 ° C and cooled by water to 620-680 ° C. After winding in the temperature range of, and then to form a car door reinforcement and heated to a temperature range of 900-950 ℃, water cooled and considerably in the temperature range of 200-300 ℃ high strength steel tube type automobile door with excellent low temperature toughness Method of manufacturing reinforcement.