Project Description

ANT-L2 Air Purifier

We are committed to integrate steel resources in china and serve the global steel market. We have 15+ years of experience in steel researching and production.

Our ability to purchase materials directly from leading mills will give you the competitive edge. Any Questions Just Call +86-731-89903933.

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AISI 4340 Alloy Steel

Our supply size :

Diameter : 80 to 600 mm ;

Length : 1000 to 9000 mm ;

Our capacity :

Delivery condition : Normalized, or Annealed, or Quenched and Tempered ;

Surface condition : Grounded, or Turned, or Polished

Our advantage :

  1. High Quality, Reasonable Price
  2. Over 40 Years Experience
  3. ISO NQA Certificated Factory
  4. Worldwide shipping
  5. Emergency Orders and Fast Delivery

Quality Standard

EN 10277 Bright steel products. Technical delivery conditions. Steels for quenching and tempering

EN 10083 Steels for quenching and tempering. Technical delivery conditions for alloy steels

EN 10269 Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

EN 10263 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for steels for quenching and tempering

EN 10250 Open steel die forgings for general engineering purposes. Alloy special steels

ASTM A29 Standard Specification Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements

All Grades Comparison

Material no. DIN BS ASTM
1.6580 30CrNiMo8 823M30 4340
AFNOR ISO GOST JIS
30CND8 31CrNiMo8 3KH3M3F SNCM431

Chemical Composition(%)

Steel Grade C Mn Si P S Cr Ni Mo
4340 0.38–0.43 0.60-0.80 0.15-0.35 0.035 max 0.040 max 0.70-0.90 1.65-2.00 0.20-0.30

Mechanical Properties

(T=20°C if not differently stated)

Heat treatment state Diameter(mm) Rm (Mpa) Rp0.2 (Mpa) Fracture elongation A5 (%) Notch impact energy ISO-V [J] Hardness (HB)
SOFT ANNEALED / 844 min / / / 250 max
ISOTHERMAL ANNEALED / 615-815 / / / 183-242
QUENCHED AND TEMPERED 16 max 880-1080 685 min 16 min 40 min 289-347
QUENCHED AND TEMPERED 16-40 930-1080 735 min 16 min 40 min 275-318
QUENCHED AND TEMPERED 40-100 880-1030 685 min 17 min 40 min 261-303
QUENCHED AND TEMPERED 100-250 785-935 635 min 18 min 35 min 233-276
QUENCHED AND TEMPERED 250-500 735-885 590 min 16 min 35 min 218-262

Heat Treatment

Annealing: Heat to 800 ℃ – 850 ℃, hold until temperature is uniform throughout the section and cool in furnace.

Hardening: Heat to 830 ℃ – 860 ℃, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.

Stress Relieving: Heat to 600 ℃ – 650 ℃, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.

Tempering: Re-heat to 450 ℃ – 660 ℃ as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air. N.B. Tempering should be avoided if possible within the range 250 ℃ – 450 ℃ due to temper brittleness.

Introduce

4340 Steel is a heat treatable, low alloy steel containing nickel, chromium and molybdenum. It is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength. A very popular, versatile steel. It can be heat-treated to produce a wide range of tensile strength in moderate sections.

Application

High voltage bolts and nuts, crankshafts, cam shafts, transmission axles, torsion bars, drive shafts, pump shafts, worm shafts, conveyor rollers, stems, pins, tie rods, clutch discs. Large-mass dies for hot stamping. 4340 Steel is widely used in the aerospace industry for structural parts of flaps assembly, fuselage and landing gear, propeller plane axles.

Machinability

4340 steel in the hardened and tempered as supplied condition is still regarded as being readily machinable and operations such as turning and drilling etc. can be carried out satisfactorily using machine manufacturers, recommendations for suitable tool type – feeds and speeds.

Welding

Welding of 4340 steel in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, as the mechanical properties will be altered within the weld heat affected zone. It is preferred that welding be carried out on 4340 steel while in the annealed condition, and that the work piece, immediately on cooling to hand warm, is then stress relieved at 640 ℃ – 660 ℃ prior to hardening and tempering.

If welding in the hardened and tempered condition is really necessary, then the work piece, immediately on cooling to hand warm, should be if possible stress relieved at 15 ℃ below the original tempering temperature (if known).

Mill′s test certificate

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.

We are committed to integrate steel resources in china and serve the global 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 before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.

What’s more, we have built long, deep and close business relationship with dozens of steel company, 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. We provide preffesional one-stop service to the Contractors of follows project:

  • Oil and Gas Pipeline Construction
  • Onshore and Offshore
  • Boiler Manufacturers
  • Oil Refining Equipment
  • Petroleum and Chemical Plant Construction
  • Fire Protection
  • Heating & Air Conditioning

Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.

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    ShunFu Metal is proud to provide each of our customers with a quality experience, both with products and customer service. Every product is made under strict quality control system.