JP2021073376A - 優れた機械加工性を有する低温硬質鋼 - Google Patents
優れた機械加工性を有する低温硬質鋼 Download PDFInfo
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- JP2021073376A JP2021073376A JP2021010348A JP2021010348A JP2021073376A JP 2021073376 A JP2021073376 A JP 2021073376A JP 2021010348 A JP2021010348 A JP 2021010348A JP 2021010348 A JP2021010348 A JP 2021010348A JP 2021073376 A JP2021073376 A JP 2021073376A
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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Abstract
Description
−特殊鋼の粗加工ステップ、
−応力リリーフステップ、
−粗加工の仕上げステップ、
−熱処理ステップ、
−最終機械加工ステップ、
−表面処理(窒化、炭化…)および/またはコーティングステップ、
を有する。
(a)以下の少なくとも一つの成分を含む組成を有する鋼を提供するステップ:
%Ni<1% または
%Cr>4% または
%C≧0.33% または
%Mo>2.5% または
%Al<0.6% または
W、Zr、Ta、Hf、Nbの少なくとも一つ≧0.01% または
S、P、Bi、Se、Teの少なくとも一つ≧0.01%、
(b)選択された組成において、熱処理(Ac1)によりオーステナイトの形成を開始させる臨界温度を定めるステップ、
(c)前記鋼をAc1を超える温度に加熱し、冷却する熱処理を実施するステップ
を有する。
%Ceq=0.16〜1.9 %C=0.16〜1.9 %N=0〜1.0 %B=0〜0.6
%Cr<3.0 %Ni=0〜6 %Si=0〜1.4 %Mn=0〜3
%Al=0〜2.5 %Mo=0〜10 %W=0〜10 %Mn=0〜3
%Ta=0〜3 %Zr=0〜3 %Hf=0〜3 %V=0〜4
%Nb=0〜1.5 %Cu=0〜2 %Co=0〜6
残りの成分は鉄およびトレース元素であり、
%Ceq=%C+0.86*%N+1.2*%B
%Mo+1/2・%W>2.0
の組成を有する。
%Ceq=0.15〜3.0 %C=0.15〜3.0 %N=0〜1.6 %B=0〜2.0
%Cr>4.0 %Ni=0〜6.0 %Si=0〜2.0 %Mn=0〜3
%Al=0〜2.5 %Mo=0〜15 %W=0〜15 %Ti=0〜2
%Ta=0〜3 %Zr=0〜3 %Hf=0〜3 %V=0〜12
%Nb=0〜3 %Cu=0〜2 %Co=0〜6
残りは鉄およびトレース元素で構成され、
%Ceq=%C+0.86*%N+1.2*%B
の組成を有する。
%Ceq=0.15〜2.0 %C=0.15〜0.9 %N=0〜0.6 %B=0〜0.6
%Cr>11.0 %Ni=0〜12 %Si=0〜2.4 %Mn=0〜3
%Al=0〜2.5 %Mo=0〜10 %W=0〜10 %Ti=0〜2
%Ta=0〜3 %Zr=0〜3 %Hf=0〜3 %V=0〜12
%Nb=0〜3 %Cu=0〜2 %Co=0〜12、
残りは鉄およびトレース元素で構成され、
%Ceq=%C+0.86*%N+1.2*%B
の組成を有する。
%Ceq=0.5〜3.0 %C=0.5〜3.0 %N=0〜2.2 %B=0〜2.0
%Cr=0.0〜14 %Ni=0〜6.0 %Si=0〜2.0 %Mn=0〜3
%Al=0〜2.5 %Mo=0〜15 %W=0〜15 %Ti=0〜4
%Ta=0〜4 %Zr=0〜12 %Hf=0〜4 %V=0〜12
%Nb=0〜4 %Cu=0〜2 %Co=0〜6、
残りは鉄およびトレース元素で構成され、
%Ceq=%C+0.86*%N+1.2*%B
の組成を有する。
%Ceq=0.2〜0.9 %C=0.2〜0.9 %N=0〜0.69 %B=0〜0.6
%Cr=0.0〜4.0 %Ni=0〜6.0 %Si=0〜2.8 %Mn=0.2〜3
%Al=0〜2.5 %Mo=0〜6 %W=0〜8 %Ti=0〜2
%Ta=0〜2 %Zr=0〜2 %Hf=0〜2 %V=0〜4
%Nb=0〜2 %Cu=0〜2 %Co=0〜6、
残りは鉄およびトレース元素で構成され、
%Ceq=%C+0.86*%N+1.2*%B、
の組成を有し、
%Si+%Mn+%Ni+%Cr>2.0または
%Mo>1.2または
%B>2ppm
である。
%Ni<1%、または
%Cr>4%、または
%C≧0.33%、または
%Mo>2.5%、または
%Al<0.6%、または
W、Zr、Ta、Hf、Nb、La、Acの少なくとも一つ≧0.01%、または
S,、P、Bi、Se、Teの少なくとも一つ≧0.01%。
−摩擦学的特性を改善する:表面硬化(レーザ、誘導…)、表面処理(窒化、炭化、ホウ化、硫化、これらのいかなる組み合わせ)、コーティング(CVD、PVD、流動床、熱噴射、コールドスプレー、クラッド化…)。
−耐食性の向上:硬質クロム、パラジウム、化学ニッケル処理、耐食性樹脂のゾルゲル、耐食性または耐酸化性を提供する電解または無電解処理。
−機能が明らかな場合、他の機能層。
本発明の鋼組成を高精度で異なるホットワーク用途に適用するいくつかの例について説明する。
45HRc以下の硬度で供給された高熱伝導性鋼(42W/mK超および8.5mm2/s超、50HRcで57W/mKおよび13.5mm2/sに達し、本例の全ての鋼において、熱伝導度および拡散性は、少なくとも40HRcまでの低い硬度で上昇する)を、機械加工の大部分を実施した後、48HRcを超える硬度に高めた。
Ceq:0.3〜0.6 Cr<3.0%(Cr<0.1%が好ましい)、
V:0〜0.9%、
Si:<0.15%(酸化物インクルージョンの許容可能レベルで%Si<0.1が好ましい)
Mn:<1.0% Moeq:2.0〜8.0、ここでMoeq=%Mo+1/2%W、
Ceq=%C+0.86*%N+1.2*%B。
以下の表1は、得られた特性を示す。
**供給は、焼き戻し処理なし、または580℃未満で1もしくは2以上の焼き戻しサイクルを行った、大きな断面の大部分がベイナイト微細構造を有するもので実施。
***供給は、焼き戻し処理なし、または580℃未満で1もしくは2以上の焼き戻しサイクルを行った、マルテンサイト微細構造を有するもので実施。
(別の例)
**供給は、焼き戻し処理なし、または580℃未満で1もしくは2以上の焼き戻しサイクルを行った、大きな断面の大部分がベイナイト微細構造を有するもので実施。
***供給は、焼き戻し処理なし、または580℃未満で1もしくは2以上の焼き戻しサイクルを行った、パーライトの島を含むマルテンサイト微細構造を有するもので実施。
(別の例)
Claims (5)
- ベイナイトを含む微細構造を有する鋼であって、
前記ベイナイトは、前記微細構造の少なくとも50体積%であり、
固溶体中に、2.2wt%以上、鉄よりも強い炭化物フォーマーが存在し、
前記微細構造は、最大2%のパーライトを含み、
当該鋼は、重量%表示で以下の組成を有する、鋼:
%Ceq=0.16〜1.9 %C=0.16以上0.9未満 %N=0〜1.0 %B=0〜0.6
%Cr<1.8 %Ni=0〜6 %Si=0〜1.4 %Mn=0〜3
%Al=0〜2.5 %Mo=0〜10 %W=0〜10 %Ti=0〜2
%Ta=0〜3 %Zr=0〜3 %Hf=0〜3 %V=0〜4
%Nb=0〜1.5 %Cu=0〜2 %Co=0〜6、
残りは鉄およびトレース元素であり、
%Ceq=%C+0.86*%N+1.2*%Bであり、
%Mo+1/2・%W>2.0である。 - 前記ベイナイトは、焼き戻しベイナイトである、請求項1に記載の鋼。
- 熱拡散率が8mm2/sを超える、請求項1または2に記載の鋼。
- ベイナイトを含む微細構造を有する鋼を製造する方法であって、
前記ベイナイトは、前記微細構造の少なくとも50vol%であり、
当該方法は、
(a)鋼組成物を提供するステップであって、
前記鋼組成物は、重量%表示で、以下の組成
%Ceq=0.16〜1.9 %C=0.16〜1.9 %N=0〜1.0 %B=0〜0.6
%Cr<1.8 %Ni=0〜6 %Si=0〜1.4 %Mn=0〜3
%Al=0〜2.5 %Mo=0〜10 %W=0〜10 %Ti=0〜2
%Ta=0〜3 %Zr=0〜3 %Hf=0〜3 %V=0〜4
%Nb=0〜1.5 %Cu=0〜2 %Co=0〜6、
を有し、
残りは鉄およびトレース元素であり、
%Ceq=%C+0.86*%N+1.2*%Bであり、
%Mo+1/2・%W>2.0である、ステップと、
(b)選択された組成に対して、加熱(Ac1)によりオーステナイトの形成を開始する臨界温度を定めるステップと、
(c)前記鋼をAc1を超える温度に加熱し、冷却するステップを有する熱処理を実施するステップと、
を有する方法。 - さらに、ステップ(c)の後、
(d)焼き戻し温度と硬さの間のグラフを定めるステップ、および
(e)前記鋼に対して、最大二次硬度ピークの温度未満の温度で、応力リリーフし、または焼き戻し処理するステップ、
を有する、請求項4に記載の方法。
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KR20200053648A (ko) | 2020-05-18 |
CA2872748A1 (en) | 2013-11-14 |
US20180363110A1 (en) | 2018-12-20 |
KR20150013256A (ko) | 2015-02-04 |
US20150118098A1 (en) | 2015-04-30 |
JP2018109235A (ja) | 2018-07-12 |
US10077490B2 (en) | 2018-09-18 |
JP2015521235A (ja) | 2015-07-27 |
WO2013167580A1 (en) | 2013-11-14 |
EP2662462A1 (en) | 2013-11-13 |
US20230101304A1 (en) | 2023-03-30 |
KR20210075219A (ko) | 2021-06-22 |
JP2024019397A (ja) | 2024-02-09 |
EP2847359A1 (en) | 2015-03-18 |
CA2872748C (en) | 2021-06-22 |
KR20230003595A (ko) | 2023-01-06 |
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