特殊鋼 8620/1.6523/20CrNiMoA/SNCM220 合金鋼

概要

特殊鋼 8620/1.6523/20CrNiMoA/SNCM220 合金鋼 is a highly versatile and widely used steel variant, known for its excellent properties in terms of hardenability, strength, and toughness. This alloy steel is particularly suitable for applications requiring high wear resistance and fatigue strength. It’s a low-carbon, low-alloy steel containing nickel, chromium, and molybdenum as its primary alloying elements. In this article, we will delve deep into the specifics of this special steel, covering its chemical composition, properties, applications, specifications, suppliers, and more. Let’s embark on this detailed exploration.

Chemical Composition of Special Steel 8620/1.6523/20CrNiMoA/SNCM220 Alloy Steel

Understanding the chemical composition of this alloy steel is crucial as it directly influences its mechanical properties and suitability for various applications.

元素	コンテンツ（%）
炭素 (C)	0.18 – 0.23
ケイ素 (Si)	0.15 – 0.35
マンガン (Mm)	0.70 – 0.90
リン (P)	≤ 0.035
硫黄 (S)	≤ 0.035
クロミウム (Cr)	0.40 – 0.60
ニッケル（Ni）	0.40 – 0.70
モリブデン (Mo)	0.15 – 0.25

の特性と特徴 特殊鋼 8620/1.6523/20CrNiMoA/SNCM220 合金鋼

This alloy steel’s properties make it highly desirable for various demanding applications.

プロパティ	説明
硬化性	Good, can be carburized
タフネス	High, even at low temperatures
摩耗抵抗性	Excellent, due to its hard surface layer after heat treatment
疲労強度	Superior, suitable for cyclic loading applications
機械加工性	Good, easy to machine in both annealed and hardened conditions
溶接性	Fair, can be welded with proper precautions

Mechanical Properties of Special Steel 8620/1.6523/20CrNiMoA/SNCM220 Alloy Steel

プロパティ	価値
引っ張り強度	800 – 1100 MPa
降伏強度	400 – 650 MPa
伸び	12 – 18%
硬度（HRC）	28 – 34
衝撃強度	High, suitable for high-stress applications

Applications of Special Steel 8620/1.6523/20CrNiMoA/SNCM220 Alloy Steel

The versatility of this steel makes it suitable for a broad range of applications.

申し込み	詳細
自動車部品	Used in gears, crankshafts, and connecting rods due to high fatigue strength
産業用機器	Ideal for manufacturing machine parts that require high wear resistance
航空宇宙	Suitable for producing components that must withstand high stress and temperature
ツーリング	Used in the production of dies and molds due to its good machinability and hardness
石油・ガス産業	Employed in drill collars and other downhole tools due to its toughness and wear resistance

仕様 特殊鋼 8620/1.6523/20CrNiMoA/SNCM220 合金鋼

仕様	詳細
スタンダード	ASTM A29, ASTM A322, JIS G4053
グレード	8620, 1.6523, 20CrNiMoA, SNCM220
サイズ	Available in rounds, squares, flats, and hexagonal bars
熱処理	Can be annealed, normalized, or carburized

Standards and Grades

スタンダード	グレード
ASTM	8620
DIN	1.6523
日本工業規格	SNCM220
GB	20CrNiMoA

Suppliers and Pricing of Special Steel 8620/1.6523/20CrNiMoA/SNCM220 Alloy Steel

Finding reliable suppliers and understanding pricing is essential for procurement.

サプライヤー	所在地	価格の範囲 (kg あたり)
ABCスチール	アメリカ	$2.00 – $2.50
XYZ Metals Ltd	ドイツ	€1.80 – €2.20
Shanghai Steel	中国	¥15 – ¥20
グローバル合金	英国	£1.50 – £2.00

Advantages and Limitations of Special Steel 8620/1.6523/20CrNiMoA/SNCM220 Alloy Steel

利点

• 汎用性がある： Suitable for a wide range of applications.
• 高い強度とタフネス： Makes it ideal for demanding applications.
• Good Wear Resistance: Extends the life of components.
• 優れた硬化性： Ensures a hard surface layer post heat treatment.

制限事項

• コストだ： More expensive than some other steels due to its alloying elements.
• 溶接性： Requires careful welding practices to avoid cracking.
• 空室状況 May not be readily available in all regions, leading to longer lead times.

他の合金鋼との比較

特徴	8620/1.6523/20CrNiMoA/SNCM220	4140	4340
硬化性	良い	非常に良い	優れている
摩耗抵抗性	優れている	良い	非常に良い
タフネス	高	モデレート	高
コスト	高い	モデレート	高い
機械加工性	良い	良い	モデレート

Heat Treatment of Special Steel 8620/1.6523/20CrNiMoA/SNCM220 Alloy Steel

Heat treatment is a critical process that enhances the mechanical properties of this alloy steel.

Carburizing Process

• Objective: To increase surface hardness while maintaining a tough core.
• Procedure:

1. Heating: Heat the steel to 900-950°C.
2. 浸炭： Maintain at this temperature in a carbon-rich environment.
3. 焼き入れ： Rapid cooling in oil or water to harden the surface.
4. 焼き戻し： Reheating to 150-200°C to reduce brittleness.

Annealing Process

• Objective: To soften the steel for improved machinability.
• Procedure:

1. Heating: Heat to 820-850°C.
2. Holding: Maintain at this temperature for a suitable duration.
3. Cooling: Slow cooling in the furnace.

Comparative Analysis: Special Steel 8620 vs. Other Steels

Special Steel 8620 vs. 4140 Alloy Steel

特徴	8620 Alloy Steel	4140 合金鋼
硬化性	良い	非常に良い
摩耗抵抗性	優れている	良い
タフネス	高	モデレート
機械加工性	良い	良い
コスト	高い	モデレート

Special Steel 8620 vs. 4340 Alloy Steel

特徴	8620 Alloy Steel	4340 Alloy Steel
硬化性	良い	優れている
摩耗抵抗性	優れている	非常に良い
タフネス	高	高
機械加工性	良い	モデレート
コスト	高い	高い

Selecting the Right Steel for Your Application

Choosing the right steel involves considering several factors including mechanical properties, cost, availability, and specific application requirements. Special Steel 8620/1.6523/20CrNiMoA/SNCM220 is an excellent choice for applications requiring a balance of toughness, wear resistance, and hardenability. However, for applications demanding higher strength and toughness, steels like 4340 may be more suitable despite the higher cost.

結論

特殊鋼 8620/1.6523/20CrNiMoA/SNCM220 合金鋼 is a highly versatile material that meets a wide range of industrial needs due to its superior mechanical properties. Whether you’re in the automotive, aerospace, or machinery industry, understanding its characteristics and applications can significantly enhance your project outcomes. This guide aims to provide you with comprehensive knowledge, enabling you to make informed decisions when selecting materials for your applications.

よくあるご質問（FAQ）

質問	回答
What are the primary alloying elements in 8620 steel?	Nickel, Chromium, and Molybdenum.
Can 8620 steel be welded?	Yes, but it requires proper precautions to avoid cracking.
What is the typical hardness of 8620 steel after heat treatment?	Between 28 and 34 HRC.
Where is 8620 steel commonly used?	In automotive components, industrial machinery, and aerospace applications.

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