8620 Sncm220 1.6523 20nicrmo22 Cold Seamless Steel Tube

• After-sales Service: 3 Years
• Warranty: 3 Years
• Type: Seamless
• Technique: Cold Drawn
• Material: Stainless Steel
• Surface Treatment: Polished
• Model NO.: 8620 SNCM220 1.6523 20NiCrMo2-2
• Usage: Machinery Industry
• Section Shape: Round
• Transport Package: Full
• Specification: Customized
• Trademark: Shanshui
• Origin: Liaocheng
• HS Code: 7201500010
• Production Capacity: 5000 Tons/Year

Product Description

Application

AISI 8620 Steel is a low alloy nickel, chromium, molybdenum case hardening steel, generally supplied in the as rolled condition with a maximum hardness HB 255max. SAE steel 8620 offers high external strength and good internal strength, making it highly wear resistant. AISI 8620 steel has a higher core strength than grades 8615 and 8617.

Annealing

AISI 8620 steel may be given a full anneal by heat to 820ºC - 850ºC, and hold until temperature is uniform throughout the section and cool in furnace or air cooled.

Standard

ASTMA5192003SeamlessCarbonandAlloySteelMechanicalTubing

Specifications

Dimensions:Outer diameter: 83-254 mm, Wall thickness: 7 to 60 mm, length: not more than 12 meters.

 

Tolerance for OD and ID:

Cold drawn: within ±0.2mm

Cold rolled: within ±0.1mm

 

Tolerance for Wall Thickness:

Hot rolled: within +/-5%,

Cold drawn: within 0.6mm

 

Process:Hot Rolled, Cold Drawn, Precision Rolled

 

Delivery Condition:Hot rolled, Cold drawn, Annealed, Normalized, Quenched and tempered.

 

Surface Condition:Black surface, Rough turned, Peeled.

 

Chemical requirements: 

Grade	C	Mn	Pmax.	Smax.	Si	Cr	Mo	Ni
8620	0.18-0.23	0.70-0.90	0.04	0.04	0.15-0.35	0.40-0.70	0.40-0.60	0.15-0.25

Mechanical Properties

Properties	Metric	Imperial
Tensile strength	530 MPa	76900 psi
Yield strength	385 MPa	55800 psi
Elastic modulus	190-210 GPa	27557-30458 ksi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Shear modulus (typical for steel)	80 GPa	11600 ksi
Poisson's ratio	0.27-0.30	0.27-0.30
Izod Impact	115 J	84.8 ft.lb
Hardness, Brinell	149	149
Hardness, Knoop (converted from Brinell hardness)	169	169
Hardness, Rockwell B (converted from Brinell hardness)	80	80
Hardness, Vickers (converted from Brinell hardness)	155	155
Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel)	65	65

AISI 8620 Steel Grade Heat Treatment

Tempering

Tempering of heat treated and water quenched parts of 8620 steels (not carburized) is done at 400 F to 1300 F to improve case toughness with minimal effect on its hardness. This will also reduce the possibility of grinding cracks.

 

Hardening

The AISI steel 8620 will be austenitized at around 840°C - 870°C, and oil or water quenched depending upon section size and intricacy. Cool in Air or Oil required.

 

Normalizing

1675ºF (910ºC) and air cool. This is another method of improving machinability in 8620 material; normalizing might also be used prior to case hardening.

 

 

This alloy is used in the oil and gas industry as forged down-hole drilling tools such as drill collars. Other applications are forged gears, shafts for hydraulic presses, rolls for paper mills, pump shafts and tool holders