JP6466582B2 - 降伏強度800MPa級高強度鋼及びその製造方法 - Google Patents
降伏強度800MPa級高強度鋼及びその製造方法 Download PDFInfo
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- 229910000734 martensite Inorganic materials 0.000 claims description 18
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 14
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- 229910001566 austenite Inorganic materials 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 229910052720 vanadium Inorganic materials 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000001953 recrystallisation Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 2
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- 229910052748 manganese Inorganic materials 0.000 claims description 2
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- 229910001563 bainite Inorganic materials 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
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Description
本発明は、降伏強度800MPa級高強度鋼及びその製造方法に関する。
高強度、溶接容易性の構造鋼を使用して、建設機械の梁構造、起重機のアームとダンプカーの車体などの移動設備の部品を製造する場合には、設備の自重を減少させ、燃料の消耗を減少させて、作業効率を高めることができる。国際競争の激化に伴い、高強度、溶接容易性の構造鋼を使用して、港機械、鉱山機械、掘削機、ローダーの梁構造、起重機のアームとダンプカーの車体などの移動設備の部品を製造することは、既に趨勢になる。建設機械の高性能、大型化、軽量化への発展要求に応じて、建設機械用鋼の強度級別はますます高くなって、500〜600MPa級から急速に700MPa、800MPaないし1000MPa以上に高まっている。建設機械用超高強度鋼の厳しい使用環境と力受け条件のため、鋼材品質に対して厳格な要求があり、当該要求には強度性能、衝撃性能、曲げ性能、溶接性及び板形などが含まれる。
本発明の目的は、降伏強度800MPa級高強度鋼及びその製造方法を提供することにあり、上記高強度鋼は、オンライン焼入れ+焼戻し工程により製造され、その降伏強度が800〜950MPa、引張強度が850〜1000MPa、延伸率が12%超、−40℃衝撃エネルギーが40J超である。
即ち、組成の重量百分率で、C:0.06〜0.14%、Si:0.10〜0.30%、Mn:0.80〜1.60%、Cr:0.20〜0.70%、Mo:0.10〜0.40%、Ni:0〜0.30%、Nb:0.010〜0.030%、Ti:0.010〜0.030%、V:0.010〜0.050%、B:0.0005〜0.0030%、Al:0.02〜0.06%、Ca:0.001〜0.004%、N:0.002〜0.005%、P≦0.020%、S≦0.010%、O≦0.008%であり、残部がFe及び不可避的不純物であり、かつ上記元素は0.40%<Ceq<0.50%、Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15、0.7%≦Mo+0.8Ni+0.4Cr+6V≦1.1%、3.7≦Ti/N≦7.0、1.0≦Ca/S≦3.0の関係を満たす降伏強度800MPa級高強度鋼である。
本発明鋼の組成設計において:
C:固溶強化組成であり、マルテンサイト組織の強度と可塑性靱性を調整し、低炭素マルテンサイトのオンライン焼入状態の引張強度とC含有量は下記の関係を満たす。即ち、
Rm=2940C(%)+820(MPa)
Rmは引張強度であり、C含有量が0.06%以上であると、焼入れ状態での引張強度が900MPaを超えることを保証でき,焼戻しにより更に調整して、引張強度を850MPa以上に低下させ、靭性を改善できる。C含有量が高いと、全体としてC当量が向上し、溶接時、クラックが発生し易い。従って、本発明のC含有量の範囲は、0.06〜0.14%とする。
1)溶錬、鋳造工程
上記組成で転炉または電気炉で製鋼、精錬、鋳造してスラブを製造する。
スラブを1150〜1270℃の炉で加熱し、スラブの芯部が前記温度に達すると、保温を開始し、保温時間を1.5時間超とする。
スラブを目標厚さに達するように、シングルスタンドで往復に圧延し、又は複数スタンドで熱間連続圧延する。圧延仕上げ温度Tfは、820〜920℃であり、かつAr3<Tf<Tnrを満たす。
Tnrは、非再結晶の臨界温度であり、Tnr=887+464C+(6445Nb−644sqrt(Nb))+(732V−230sqrt(V))+890Ti+363Al−357Siである。
4)焼入熱処理工程
圧延後、(Ms−150)℃以下までオンライン焼入れを行う。Msはマルテンサイトが変態する開始温度で、Ms=539−423C−30.4Mn−17.7Ni−12.1Cr−11.0Si−7.0Moである。層流冷却システムは、冷却速度をV>e(5.3−2.53c−0.16Si−0.82Mn−0.95Cr−1.87Mo−160B)℃/sに制御して、全面マルテンサイト組織の形成を保証する。
焼戻し熱処理:焼戻し温度が400〜550℃であり、鋼板芯部が炉温度に達すると、保温を開始し、20〜180分間保温する。
本発明の工程(2)において、スラブを1150〜1270℃に加熱し,芯部保温時間を1.5h超とする。加熱温度が1150℃を超え、芯部保温時間が1.5hを超えると、合金元素の十分な固溶を保証できる。加熱温度が1270℃を超えると、オーステナイトの結晶粒子が成長しすぎ、結晶間の結合力が弱くなり、圧延の時にクラックが生じ易い。また、加熱温度が1270℃を超えると、スラブ表面の脱炭素を容易に引き起こし、製品の力学性能に影響する。
Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15、
0.7%≦Mo+0.8Ni+0.4Cr+6V≦1.1%、
3.7≦Ti/N≦7.0、1.0≦Ca/S≦3.0である本発明に関わる関係式において、元素符号は、対応元素の重量百分率含有量を示す。
Tnr=887+464C+(6445Nb−644sqrt(Nb))+(732V−230sqrt(V))+890Ti+363Al−357Si、
Ms=539−423C−30.4Mn−17.7Ni−12.1Cr−11.0Si−7.0Mo、
e(5.3−2.53C−0.16Si−0.82Mn−0.95Cr−1.87Mo−160B)である本発明に関わる計算式において、元素符号は対応元素の重量百分率含有量×100を示す。
本発明において、制御圧延と制御冷却、及びオンライン焼入れ+焼戻し工程により、化学組成の設計、母材組織、焼入れ加熱温度、焼戻し加熱温度などの方面から制御して、超高強度を実現するとともに、良好な延伸率、低温衝撃靭性などの性能を得ることを保証できる。
以下、実施例に基づいて本発明を更に説明する。
Claims (2)
- 組成の重量百分率で、C:0.06〜0.14%、Si:0.10〜0.30%、Mn:0.80〜1.60%、Cr:0.20〜0.70%、Mo:0.10〜0.40%、Ni:0〜0.30%、Nb:0.010〜0.030%、Ti:0.010〜0.030%、V:0.010〜0.050%、B:0.0005〜0.0030%、Al:0.02〜0.06%、Ca:0.001〜0.004%、N:0.002〜0.005%、P≦0.020%、S≦0.010%、O≦0.008%であり、残部がFe及び不可避的不純物であり、かつ前記元素は、0.40%<Ceq<0.50%、Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15、0.7%≦Mo+0.8Ni+0.4Cr+6V≦1.1%、3.7≦Ti/N≦7.0、1.0≦Ca/S≦3.0を満たし、
前記高強度鋼は、ミクロ組織が焼戻マルテンサイトであり、
前記高強度鋼は、降伏強度が800〜950MPa、引張強度抗が850〜1000MPa、延伸率が12%超、−40℃衝撃エネルギーが40J超である降伏強度800MPa級高強度鋼。 - 1)溶錬、鋳造工程
請求項1に記載の前記組成で転炉または電気炉で製鋼、精錬、鋳造してスラブを製造する;
2)スラブの加熱工程
スラブを1150〜1270℃の炉で加熱し、スラブの芯部が前記温度に達すると、保温を開始し、保温時間を1.5時間超とする;
3)圧延工程
スラブを目標厚さに達するように、シングルスタンドで往復に圧延し、又は複数スタンドで熱間連続圧延し、圧延仕上げ温度Tfは、820〜920℃であり、かつAr3<Tf<Tnrを満たし、
ここで、Ar3は、亜共析鋼オーステナイトがフェライトへ変態する開始温度であり、Ar3=901−325C−92Mn−126Cr−67Ni−149Mo、
Tnrは、非再結晶の臨界温度であり、Tnr=887+464C+(6445Nb−644(Nb) 1/2 )+(732V−230(V) 1/2 )+890Ti+363Al−357Siであり、
圧延の最終回バスの圧延の圧下率は15%超である;
4)焼入熱処理工程
圧延後、(Ms−150)℃以下までオンライン焼入れを行い、Msはマルテンサイトが変態する開始温度で、Ms=539−423C−30.4Mn−17.7Ni−12.1Cr−11.0Si−7.0Moであり、層流冷却システムは、冷却速度をV>e(5.3−2.53c−0.16Si−0.82Mn−0.95Cr−1.87Mo−160B)℃/sに制御して、全面マルテンサイト組織の形成を保証する;
5)焼戻し熱処理工程
焼戻し温度が400〜550℃であり、鋼板芯部が炉温度に達すると、保温を開始し、20〜180分間保温する焼戻し熱処理
を含む、請求項1に記載の降伏強度800MPa級高強度鋼の製造方法。
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