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

Min. bestelaantal	1 ton
Prijs	US $720-1,350 / Ton

Productdetails

Model-NR.	8620	Oppervlaktebehandeling	Gepolijst
Specificatie	Buitendiameter 6-630 mm	Productiecapaciteit	500TON
Chemische samenstelling C	0,20	Chemische samenstelling si	maximaal 0,40
Chemische samenstelling Mn	0,80	Chemische samenstelling Cr	0,53
Chemische compositie mo	0,20	Chemische samenstelling Ni	0,55
Elasticiteitsmodulus	210x10^3 N/mm2	Dikte	7,86 g/cm³
Treksterkte	≥980 MPa	Opbrengststerkte	≥ 785 Mpa
Verlenging	≥9%
Markeren	Polished Surface Alloy Steel Round Bar , High Hardenability SAE 8620 Steel Bar , Good Weldability 8620 Alloy Steel Rod

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Productomschrijving

SAE 8620H Alloy Steel Round Bar

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

Key Features

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

International Standards

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

Chemical Composition

Standard Composition (weight %)

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

Chinese Standard 20CrNiMo 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

Heat Treatment: Quenching at 850°C (oil), Tempering at 200°C (air)

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

Physical Properties

Property	Value
Modulus of Elasticity [10³ x N/mm²]	210
Density [g/cm³]	7.86

Heat Treatment Guidelines

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. After heat treatment, finish machining is minimized to preserve the hardened case, typically limited to grinding operations.

Welding

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

Cold Working

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

Applications

Widely used in transmission systems, tractor motors, and automotive components. Ideal for carburized gears, pinions, shafts, bearings, piston rings, ring gears, crankshafts, and other applications requiring hard carburized cases with tough cores.

Available Stock Sizes

Product Form	Diameter Range
Round Bar	12-380mm

Material Conditions & Forms

Available in various forms including round bars, flat bars, plates, and blocks. Conditions range from pre-hardened, hot rolled, annealed, quenched and tempered to surface finishes including black, pre-machined, grinding, and polished.

Quality Assurance

Government Certified Quality: All materials sourced directly from certified steel manufacturers to ensure consistent quality and performance.

Our Services

Quality special steel for all industrial applications
Flexible order quantities with fast shipping
Comprehensive inventory of specialty steels
Value-added services: metal cutting, sizing, machining, heat treatment
Sawing services for small or large quantities
Excellent customer service and support

Product Images

The information presented represents typical or average values and is not a guarantee of maximum or minimum specifications. Applications suggested are for illustrative purposes only. Continuous improvement of our quality management system is certified in accordance with ISO 9001 standards.

Markeringen:

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

Polished Surface Alloy Steel Round Bar

High Hardenability SAE 8620 Steel Bar

Good Weldability 8620 Alloy Steel Rod