20MnV6 / E470 Low Alloy Round Steel Tubing Seamless Mechanical Steel Pipe

20MnV6 / E470 Round Steel Tubing , Mechanical Large Diameter Steel Pipe

OVERVIEW

20MnV6 & E470 are similar grades and are high tensile low alloy carbon-manganese steel which are micro alloyed with vanadium. In E470, 20MnV6 the low carbon content and the vanadium addition allows surface hardening by carburising, carbonitriding or nitriding.

20MnV6 Hollow bars or pipes are generally supplied in the black hot rolled condition with a typical tensile strength range of 600-790 Mpa and a high typical yield strength range of 440-570 Mpa.

EN 10297-1 Grade 20MnV6 Hollow Bars are low-cost Low Carbon Steel Hollow Bars with 016-022 % carbon content with combination of 130-170 % manganese easy to form and shape .These pipes are manufactured as per EN Specification and commercially referred as cs pipes or ms pipes.

EN 10297-1 Grade 20MnV6 specification covers Hollow bars for machining. Pipe will be supplied in 5-7 metre random lengths and varnished to avoid oxidation of the steel when in storage. All pipes are fully certified and traceable with heat numbers hard stamped onto each random length. We can supply cut lengths; long pieces and even bore from forged, machined bar to satisfy your urgent demand.

APPLICATIONS

Tubular parts for the automotive, oil and gas, construction, general engineering and agricultural industry, such as bushes, hydraulic cylinders, hollow shafts, rings, hollow rolls for conveyors, nuts, gear wheels, shafts, axles, stuffing boxes, spindles, drill jigs, rolls etc.

STANDARD SPECIFICATIONS

TOLERANCE FOR SEAMLESS TUBING

Relavent Standard

-ASTM A519 Seamless Carbon and Alloy Steel Mechanical Tubing

-EN 10297-1 Seamless Circular Steel Tubes for Mechanical and General Engineering Purpose

-DIN 2448 Seamless Steel Pipes and Tubes

-JIS G3441 Alloy Steel Tubes for Machine Purpose

Related Specifications

• Europe EN 10294-1
• France NF A49312 20MV6
• Germany W.Nr 1.5217 20MV6
• W.Nr 1.8905 StE 460
• Great Britain BS4360 GR 55
• USA UNS K01907 and K12202

Chemical Requirements, Composition, %

Mechanical Properties

Surface Hardening Treatments

Carbonitriding

• Heat to 870 oC - 880 oC in a gaseous media consisting of carbon monoxide/hydrocarbon plus ammonia, hold for sufficient time to develop the required case depth, carbon and nitrogen content, followed by quenching in oil or water as required.
• Typical case hardness achieved up to Rc 60.Tempering immediately while still hand warm at 150 oC - 200 oC will reduce stresses and improve the toughness of the case.
  

Carburizing

• Pack, salt or gas carburise at 880 oC - 920 oC, holding for sufficient time to develop the required case depth and carbon content, followed by a suitable heat treatment cycle to optimise case and/or core properties.Typical case hardness achieved up to Rc 63.

Case Hardening

• Water quench from 760 oC - 780 oC.

Core Refining

• Oil quench from 870 oC - 880 oC prior to water quench as above.Tempering immediately following water quench at 150 oC -200 oC will reduce stresses and improve toughness of case.

High or Medium Frequency Induction Hardening

• The black hot rolled surface on 20MnV6 Hollow Bar will first require to be machined sufficiently to remove any decarburised layer otherwise less than satisfactory results will likely be obtained. The feed material can be either in the as supplied condition or pre hardened and tempered for higher core strength.Heat to the austenitic temperature range (870 oC - 925 oC), and required case depth, quench immediately in oil or water as required. Typical case hardness achieved up to Rc 48.Tempering immediately at 150 oC - 200 oC will reduce stress and improve the toughness of the case.
  

Nitriding

• 20MnV6 either in the as supplied condition, or pre-hardened and tempered for higher core strength will respond successfully to nitriding due to the vanadium content. Typical case hardness achieved up to Rc 55.Nitriding is carried out at 490 oC - 530 oC followed by slow cooling (no quench) reducing the problem of distortion.Parts can therefore be machined to near final size, leaving a grinding tolerance only.If pre-hardened and tempered feedstock is used always ensure that the tempering temperature employed is at least 15oC above the nitriding temperature.

Hardening

• Heat to 870 oC - 925 oC as required, hold until the temperature is uniform throughout the section, soak 10 - 15 minutes per 25mm of section and quench in oil or water as required.Temper immediately while still hand warm.

Tempering

• Re heat to 500 oC - 600 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25mm of section. Cool in still air.

Normalizing

• Heat to 900 oC - 925 oC, hold until temperature is uniform throughout the section, soak for 30 minutes and cool in still air.

Stress Relieving Following Welding

• Heat the weld area to 550 oC - 650 oC, soak for 30 minutes and cool in still air or furnace.

Notes on Heat Treatment

• Heating temperatures, rates of heating, cooling and soaking times will vary due to factors such as work piece size/shape, also furnace type employed, quenching medium and workpiece transfer facilities etc.Please consult your heat treater for best results.

Machining

• 20MnV6 has excellent machinability due to the silicon - calcium treatment and precise control of the sulphur content resulting in an excellent break-up of swarf, increasing feeds and speeds plus an increase in tool life for all machining operations.

Our Services

Payment & Delivery

1. Both T/T and L/C will be acceptable

2. Trade Terms: FOB, CIF, CFR

3. The delivery will be in 10-15 days if have stock; For customized items, the delivery will be negotiated by both parties

4. Shipping by sea freight from Shanghai Port (PRC) for Bulk orders, by airfreight or express for samples

 We, Shanghai Unite Steel are committed to integrate engineering steel resources in china and serve the global engineering steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise.

In the aspect of resources and information, we have established cooperative and stronger relationship with nearly hundred enterprises, either state-owned or private owned in china, such as: DAYE Special Steel-a famous steel enterprise with the longest steelmaking history; BAO Steel, and Dongbei Special Steel Group-the biggest special steel manufacturer; TPCO, VALIN-largest seamless steel tube production enterprise; What's more, we have built long, deep and close business relationship with dozens of steel companies, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want!