20Cr4 (欧州連合 / EN) 材料特性
その他の呼称:
材料グループ:
鉄合金 / 構造・建築鋼
国 / 規格:
欧州連合 / EN
データ更新
最新情報: 2024-12
更新の総数: 6
更新履歴:
2023-12
2020-12
2018-10
2018-08
2015-05
機械的特性
温度
粒度
Fine grain steel shall have an austenite grain size of 5 or finer. Sampling and sample preparation shall be as specified in ISO 643. The grain size shall be determined from a carburized specimen. Carburization shall be achieved by maintaining the specimen in carburizing powder at 950°C ± 10°C for 6 h. This is generally done by keeping the carburizing chamber at 950°C ± 10°C for 8 h, including a preheating period. In most cases, a carburized layer of approximately 1 mm is obtained.; Grain size of 5 or finer in accordance with ISO 653.; Steel shall have an austenite grain size of 5 or finer in accordance with ISO 643.
詳細を表示
粒度
Fine grain steel shall have an austenite grain size of 5 or finer. Sampling and sample preparation shall be as specified in ISO 643. The grain size shall be determined from a carburized specimen. Carburization shall be achieved by maintaining the specimen in carburizing powder at 950°C ± 10°C for 6 h. This is generally done by keeping the carburizing chamber at 950°C ± 10°C for 8 h, including a preheating period. In most cases, a carburized layer of approximately 1 mm is obtained.; Grain size of 5 or finer in accordance with ISO 653.; Steel shall have an austenite grain size of 5 or finer in accordance with ISO 643.
詳細を表示
物理的特性
成分
基準
値
単位
CAS 番号
基準
Al
値
≤ 0.050
単位
%
CAS 番号
7429-90-5
基準
C
値
0.17 – 0.23
単位
%
CAS 番号
7440-44-0
基準
Ca
値
Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless specifically approved by the purchaser.
単位
%
CAS 番号
7440-70-2
EN ISO 683-17: 2023 / 熱処理鋼, 合金鋼およ快削鋼 - 第17部:ボールおよびローラーベアリング鋼
熱処理
- End quench test austenitizing at 900 ± 5°C (Time for austenitizing as a guide: 30 min minimum);<br><br>Carburizing at 880-980°C (The carburizing temperature depends on the chemical composition of the steel, the mass of the product and the carburizing medium. If the steels are direct hardened, in general, a temperature of 950°C is not exceeded. For special procedures, for example under vacuum, higher temperatures (for example 1020-1050°C) are not unusual);<br><br>Direct and simple hardening at 820-860°C (The kind of quenching agent depends on, for example the shape of the products, the cooling conditions and the amount of furnace filling. If the steels are direct hardened and if there is a danger of distortion, they should be quenched from a temperature between the core-hardening and case-hardening temperatures);<br><br>Double hardening: Core-hardening at 860-900°C and Case-hardening at 780-820°C;<br><br>Tempering at 150-200°C (Time for tempering as a guide: 1h minimum).