High-Quality AISI4340 Steel Hollow Bar for Heavy-Duty Use

• Customization: Available
• Processing Object: Metal
• Molding Style: Forging
• Model NO.: A+ steel hollow bar
• Molding Technics: Pressure Casting
• Application: Machinery Parts
• Material: Steel
• Heat Treatment: Annealing
• Surface Treatment: Polishing
• Forging Tolerance: +/-0.1mm
• Standard: ASTM
• Certification: CE, ISO 9001:2000, ISO 9001:2008
• Size: 1/2′′ to 500′′
• Cncturning: Roungh Machining
• Technology: AISI4340 Steel Hollow Bar Forging
• Od: 1/2′′ to 500′′
• Transport Package: Wooden Package and Steel Package
• Specification: steel hollow bar
• Trademark: aisi4140 steel hollow bar
• Origin: Jiangsu China
• HS Code: 73269090
• Production Capacity: 1PCS Need 20-30days

Product Description

Name: Forging aisi4140 aisi4340 steel bright hollow bar

We are the manufacturer specialized in machining heavy duty forging parts for nearly 18 years. Our products, such as drive shaft, Forging Hollow Shaft, Shaft Sleeve, Eccentric shaft, Forging rod, Large bolt, Heavy Duty  Hydraulic Cylinder, are widely used in coiled material, petroleum, metallurgy, mine, machinery and transportation industry etc!

Product List

Name	Technique	Material	Dia/mm	Wall thickness	Length/mm
Forging shaft	Forging+turning+grinding	Alloy steel  Carbon steel Stainless steel	200-800	----	500-10000
Hollow shaft	Forging+drilling+turning		150-800	≥15mm	≤7000
Shaft sleeve	Forge+drill & bore+turning +milling		400-700	≥15mm	≤8000
Large bolt	Rolled/forge+turning+threading		300-800	----	≤7000
Hydraulic cylinder	Forging+drill & bore+ turning		300-2000	≥10mm	≤10000
Other parts in deep-hole	Forge+ drill & bore+turning+mill		300-2000	----	≤10000

Product Flow
1.Inquiry with drawings in details.
2.Confirm steel material, chemical compositions, mechanical properties, tolerance.
3.Confirm payment terms,order materials or check material in stock.
4.Check material chemical compositions, material weight, dimensions.
5.Cut materials record weight, making mould for casting of pr-hearting for forging.
6.Forging ratios, heat treatment ,dimension check.
7.Rough machining, UT test,heat treatment.
8.Semi-finish, quenching.
8.Fine machining, UT test, dimension inspection, mechanical properties test.
9.Customer inspection, packing, delivery arrangement.
Steel ingot making
EAF + LF + VD/VAD or ESR
Manufacturing process
EAF + LF + VD + Forging+ Normalizing & Tempering + Rough machining + UT test + Quenching & Tempering + Precision machining
Report
Chemical composition report, Physical properties report, Heat treatment report, Dimensional inspection report, NDT report,Nondestructive test (NDT), UT ( ultrasonic testing ), MT ( magnetic particle testing ), PT ( penetrant testing)
Quality certification: ISO 9001: 2008, IQNET