JP2017137565A - 快削用粉末冶金鋼製品およびその製造方法 - Google Patents
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Abstract
Description
広い範囲 好ましい範囲
C 0.88〜1.00 0.92〜0.98
Mn 0.20〜0.80 0.20〜0.80
Si 最大0.50 0.12〜0.22
P 最大0.050 最大0.030
S 0.010〜0.100 0.010〜0.090
Cr 0.15〜0.90 0.30〜0.60
Ni 0.10〜0.50 0.10〜0.25
Mo 最大0.25 最大0.25
Cu 0.08〜0.23 0.10〜0.23
V 0.025〜0.15 0.035〜0.060
N 最大0.060 最大0.060
O 最大0.040 最大0.040。
合金の残りは鉄および通常不純物である。本発明の一つの観点によるワイヤーおよび棒は、i)均一、微細粒径、好ましくはASTM E−112結晶粒度番号(grain size number)8以上を有するフェライトマトリックス、ii)前記マトリックス中に均一に分布されたで約2μm以下の主寸法を有する硫化マンガンの均一分布およびiii)前記マトリックス中に均一に分布された約4μm以下の主寸法を有する微細球状炭化物の均一分布を含む微細構造を特徴とする。
以下の重量%組成:
C 0.88〜1.00、
Mn 0.20〜0.80、
Si 最大0.50、
P 最大0.050、
S 0.010〜0.100、
Cr 0.15〜0.90、
Ni 0.10〜0.50、
Mo 最大0.25、
Cu 0.08〜0.23、
V 0.025〜0.15、
N 最大0.060、
O 最大0.040、
鉄および通常不純物 残部
前記方法は、更に、前記鋼合金を不活性ガスで微粉化して、プレ合金鋼粉末を形成する工程および前記鋼粉末を実質上フルデンシティに固化して粉末圧縮体を形成する工程を含む。粉末圧縮体は、熱加工して長尺の中間製品を形成する。前記方法は、また、以下の工程:a)前記中間製品を、合金Acm温度より約40℃低い温度〜合金Acm温度より約25℃高い温度の範囲の第1温度で、前記中間製品の厚さ1インチに付き約45〜90分間加熱する工程;b)前記中間製品を、前記合金から前記中間製品中に1以上のマルテンサイト、上部ベイナイト、下部ベイナイトおよびそれらの組合せに変形するのに十分な速度で、前記第1温度から冷却する工程、c)前記中間製品を、合金A1温度より約150℃低い温度〜A1温度の範囲の第2温度で、前記合金のマトリックス材料中に複数の微細炭化物を沈殿するのに十分な時間加熱する工程;d)前記再加熱した中間製品を第2温度から空気中で冷却する工程;e)前記中間製品を、前記合金A1温度より約10〜50℃高い第3温度で、厚さ1インチに付き約1.5〜6時間加熱する工程;f)前記中間製品を、約5〜80℃/時の速さで、第3温度からA1温度より約100〜400℃低い中間温度に冷却する工程、および次いで、g)前記中間製品を中間温度から室温に空気冷却する工程、を行うことによって中間製品を熱処理することを包含する。次に、熱処理された製品は更に加工してその断面積を小さくして、精密機械の部品用の小さな断面積または径を有する長尺製品、例えばワイヤー、ロッド、ストリップまたは棒を提供する。更なる工程は、冷間引抜きおよび/または冷間圧延を包含してもよい。冷間引抜きおよび冷間圧延工程は、最終の大きさまで1以上の工程で行ってもよい。
Claims (10)
- 以下の工程を有する細径長尺鋼製品の製造方法であって、
以下の重量%組成:
C 0.88〜1.00、
Mn 0.20〜0.80、
Si 最大0.50、
P 最大0.050、
S 0.010〜0.100、
Cr 0.15〜0.90、
Ni 0.10〜0.50、
Mo 最大0.25、
Cu 0.08〜0.23、
V 0.025〜0.15、
N 最大0.060、
O 最大0.040、
残り鉄および通常不純物、
を有する鋼合金を溶融炉中で溶融する工程、
前記鋼合金を不活性ガスで微粉化して、プレ合金鋼粉末を形成する工程、
前記鋼粉末を実質上フルデンシティに固化して粉末圧縮体を形成する工程、
前記粉末圧縮体を熱間加工して長尺中間製品を形成する工程、
前記中間製品を以下の工程を行うことによって熱処理する工程:
a)前記中間製品を、合金Acm温度より約40℃低い温度〜合金Acm温度より約25℃高い温度の範囲の第1温度で、前記中間製品の厚さ1インチに付き約45〜90分間加熱する工程;
b)前記中間製品を、前記合金を前記中間製品中に1以上のマルテンサイト、上部ベイナイト、下部ベイナイトおよびそれらの組合せに変形するのに十分な速度で、前記第1温度から冷却する工程、
c)前記中間製品を、合金A1温度より約150℃低い温度〜A1温度の範囲の第2温度で、前記合金のマトリックス材料中に複数の微細炭化物を沈殿するのに十分な時間加熱する工程、
d)前記再加熱した中間製品を第2温度から冷却する工程、
e)前記中間製品を、前記合金A1温度より約10〜50℃高い第3温度で、厚さ1インチに付き約1.5〜6時間加熱する工程、
f)前記中間製品を、約5〜80℃/時の速さで、第3温度からA1温度より約100〜400℃低い中間温度に冷却する工程、および次いで
g)前記中間製品を中間温度から室温に空気冷却する工程、
を包含する細径長尺鋼製品の製造方法。 - 前記熱処理工程後、前記長尺中間製品を冷間引抜きして前記長尺中間製品の断面を減少して、精密機械の部品用の小さな断面を有する長尺製品を提供する工程を包含する、請求項1記載の製造方法。
- 前記熱間加工が、前記中間製品を熱圧延して前記熱処理工程前に中間製品の断面積を減少することを含む、請求項1記載の製造方法。
- 鋼合金を微粉化する工程において、合金を窒素ガスで微粉化する、請求項1記載の製造方法。
- 前記鋼粉末を固化する工程が、鋼粉末の熱間静水圧圧縮成形(hot isostatic pressing)することを含む、請求項1記載の製造方法。
- 前記鋼合金が、下記の重量%組成:
C 0.92〜0.98、
Mn 0.20〜0.80、
Si 0.12〜0.22、
P 最大0.030、
S 0.010〜0.090、
Cr 0.30〜0.60、
Ni 0.10〜0.25、
Mo 最大0.25、
Cu 0.10〜0.23、
V 0.035〜0.060、
N 最大0.060、
O 最大0.040、
残り鉄および通常不純物、
を有する、請求項1記載の製造方法。 - 以下の重量%組成:
C 0.88〜1.00、
Mn 0.20〜0.80、
Si 最大0.50、
P 最大0.050、
S 0.010〜0.100、
Cr 0.15〜0.90、
Ni 0.10〜0.50、
Mo 最大0.25、
Cu 0.08〜0.23、
V 0.025〜0.15、
N 最大0.060、
O 最大0.040、
残り鉄および通常不純物、
を有する鋼合金から溶融炉中で形成された完全に固化され、プレ合金化した金属粉末を含有する細径長尺鋼製品であって、前記固化した金属粉末が
a)ASTM標準仕様(Standard Specification)E112で決定した結晶粒度番号(grain size number)少なくとも約8によって特徴づけられる微粒子の実質上均一分布を有するフェライトマトリックス;
b)フェライトマトリックス中に均一に分布された複数の炭化物であって、前記炭化物が実質的に球体形状を有し、かつ約4μm以下の主寸法(major dimension)を有するもの;および
c)フェライトマトリックス中に均一に分布され、約2μm以下の主寸法を有する複数の硫化物、
を含有するミクロ構造を有する、ことを特徴とする細径長尺鋼製品。 - 前記製品が、15mmまでの直径を有するワイヤーを含有する請求項7記載の鋼製品。
- 前記製品が、6.5mmまでの直径を有するワイヤーを含有する請求項7または8記載の鋼製品。
- 前記鋼合金が、下記の重量%組成:
C 0.92〜0.98、
Mn 0.20〜0.80、
Si 0.12〜0.22、
P 最大0.030、
S 0.010〜0.090、
Cr 0.30〜0.60、
Ni 0.10〜0.25、
Mo 最大0.25、
Cu 0.10〜0.23、
V 0.035〜0.060、
N 最大0.060、
O 最大0.040、
残り鉄および通常不純物、
を有する、請求項7〜9いずれかに記載の鋼製品。
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| CN112126760B (zh) * | 2020-09-25 | 2022-05-24 | 攀钢集团研究院有限公司 | 免时效82b热轧盘条的制备方法 |
| CN112080618B (zh) * | 2020-09-25 | 2022-05-24 | 攀钢集团研究院有限公司 | 82b热轧盘条心部马氏体及晶界渗碳体的控制方法 |
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| US8795584B2 (en) * | 2008-09-12 | 2014-08-05 | Crs Holdings, Inc. | Free-machining powder metallurgy steel articles and method of making same |
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| JP7185574B2 (ja) | 2019-03-25 | 2022-12-07 | 株式会社神戸製鋼所 | 鋼材 |
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| ES2691992T3 (es) | 2018-11-29 |
| EP3165308B1 (en) | 2018-07-18 |
| US10704125B2 (en) | 2020-07-07 |
| EP3165308A1 (en) | 2017-05-10 |
| PL3165308T3 (pl) | 2019-05-31 |
| US20170130306A1 (en) | 2017-05-11 |
| JP6479743B2 (ja) | 2019-03-06 |
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