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コンタクトパーソン : Gao

電話番号 : 18068357371

Whatsapp : +8618068357371

Polished Surface SAE 8620 Alloy Steel Round Bar with High Hardenability and Good Weldability

最小注文数量	1トン
価格	US $850-1,350 / Ton

商品の詳細

直径	外径6～630mm	材料構成	合金
表面処理	ポリッシュ	炭素含有量	0.17～0.23%
シリコン含有量	0.17～0.37%	マンガンの内容	0.6～0.95%
クロムの内容	0.4-0.7%	モリブデン含有量	0.20～0.30%
抗張力	≧980MPa	降伏強さ	≥785Mpa
伸長	≥9%	削減エリア	40％以上
衝撃エネルギー	≥47 J	密度	7.86g/cm3
弾性率	210×103N/mm2
ハイライト	Polished Surface Alloy Steel Round Bar , High Hardenability SAE 8620 Round Bar , Good Weldability 20NiCrMo2 Steel Bar

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製品の説明

AISI 8620 1.6523 Alloy Steel Round Bar

SAE 8620H Alloy Round Bar | UNS G86200 Bar | 20NiCrMo2-2 Sncm220

SAE 8620 is an alloy construction steel with excellent hardenability, good weldability, and superior machinability. This low carbon nickel chromium molybdenum alloy offers outstanding carburized properties, formability, and weldability, making it the most widely used carburizing alloy in industrial applications.

Key Features

Excellent machinability performance
Superior cold strain plasticity
Good weldability characteristics
High hardenability without post-tempering fragility

International Standards Equivalents

Brand Name	Ravne No.	Mat. No.	DIN	EN	AISI
20NCD2	769	1.6523	21NiCrMo2	20NiCrMo2	8620

Chemical Composition (Weight %)

C	Si	Mn	Cr	Mo	Ni	V	W	Others
0.20	max. 0.40	0.80	0.53	0.20	0.55	-	-	-

Detailed Composition

Grades	C	Si	Mn	P	S	Cr	Mo	Cu	Ni
20CrNiMo	0.17-0.23	0.17-0.37	0.6-0.95	≤0.035	≤0.035	0.4-0.7	0.20-0.30	≤0.30	/

Mechanical Properties

Quenching Temperature: 850°C (Oil cooled)
Tempering: 200°C (Air cooled)

Property	Value
Tensile Strength σb (MPa)	≥980(100)
Yield Strength σs (MPa)	≥785(80)
Elongation δ5 (%)	≥9
Reduction of Area ψ (%)	≥40
Akv (J)	≥47

Physical Properties

Modulus of Elasticity: 210 × 10³ N/mm²
Density: 7.86 g/cm³

Heat Treatment Specifications

Soft Annealing

Heat to 650-700°C, cool slowly. Maximum Brinell hardness: 212

Heat Treatment Processes

Treatment	Temperature	Cooling
Case Hardening	880-980°C	Oil (water), hot bath 160-250°C
Carburising	880-980°C	Oil (water), hot bath 160-250°C
Direct Hardening	880-980°C	Oil, hot bath 160-250°C
Core Refining	860-900°C	Oil, hot bath 160-250°C
Core Refining	780-820°C	Oil, hot bath 160-250°C
Tempering	150-200°C	Air

Hardenability Data

Distance From Quenched End (mm)	1.5	3	5	7	9	11	13	15	20	25	30	35	40
H max.	49	48	45	42	36	33	31	30	27	25	24	24	23
H min.	41	37	31	25	22	20	-	-	-	-	-	-	-

Manufacturing Processes

Forging

Hot forming temperature: 1150-850°C

Machinability

Machining is performed prior to carburizing to achieve close tolerances. Post-heat treatment machining is minimized to preserve the hardened case, typically limited to grinding operations.

Welding

Suitable for conventional gas or arc welding methods. Preheating at 200°C is recommended, followed by post-weld heat treatment according to approved procedures.

Cold Working

Cold working is performed in the annealed condition using conventional methods, completed to close tolerances before heat treatment or carburizing.

Applications

This alloy is widely used in transmission systems, tractor motors, and automotive components. Ideal for high-class carburization and cyanide carburizing parts including:

Gears and pinions
Shafts and bearings
Piston rings and ring gears
Crankshafts
Oil drilling components
Mining claws and cones

Available Sizes and Conditions

Round Bar Diameter: 12-380mm
Available Forms: Round bars, flat bars, plates, blocks
Conditions: Pre-hardened, hot rolled, annealed, quenched and tempered
Surface Conditions: Black, pre-machined, grinding, polish

Quality Assurance

We source materials exclusively from certified steel manufacturers to ensure consistent quality and performance. Our quality management system is certified in accordance with ISO 9001, with regular audits and recertification to maintain the highest standards.

Our Services

Quality special steel for all industries
Orders of any size and length with fast shipping
Unique inventory of specialty steel
Value-added services: metal cutting, sizing, machining, heat treatment
Sawing services for small or large quantities
Excellent customer service and support

Product Images

Note: The information presented represents typical or average values and is not a guarantee of maximum or minimum values. Applications suggested are for illustration purposes only.

札:

Polished Surface SAE 8620 Alloy Steel Round Bar with High Hardenability and Good Weldability

Polished Surface Alloy Steel Round Bar

High Hardenability SAE 8620 Round Bar

Good Weldability 20NiCrMo2 Steel Bar