150 visiting now: 137 USA USA flag 8 Belgium Belgium flag 5 UK UK flag 3 Singapore Singapore flag 1 Australia Australia flag

Highlighted Companies

Impact Resistance Astm 4340 Steel Round Bar Plate Sheets - China

price: 1123.00 Dollar US$

4340 Steel Round Bar Sheet Plate Heat Treatment and Process

Stress Relieving

For pre-hardened steel stress relieving is achieved by heating steel 4340 to between 500 to 550°C.

Heat to 600 °C – 650 °C, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm section, and cool in still air.

Cold Working

AISI 4340 alloy steel can be cold worked using all conventional methods in the annealed condition.

It has high ductility.

Annealing

A full anneal may be done at 844°C (1550 F) followed by controlled (furnace) cooling at a rate not faster than 10°C (50 F) per hour down to 315°C (600 F).

From 315°C 600 F, it may be air cooled.

Tempering

AISI 4340 alloy steel should be in the heat treated or normalized and heat treated condition before tempering.

The tempering temperature for depends upon the strength level desired.

For strength levels in the 260 – 280 ksi range temper at 232°C (450 F).

For strength in the 125 – 200 ksi range temper at 510°C (950 F).

And don’t temper the 4340 steels if it is in the 220 – 260 ksi strength range as tempering can result in degradation of impact resistance for this level of strength.

Tempering should be avoided if possible within the range 250 °C – 450 °C due to temper brittleness.

4340 Steel Heat Treatment

AISI 4340 alloy steel is heat treated at 830°C (1525°F) followed by quenching in oil.

Flame or Induction Hardening

As mentioned above, pre-hardened and tempered 4340 steel bars or plates can be further surface hardened by either the flame or induction hardening methods resulting in a case hardness in excess of Rc 50 - AISI 4340 steel parts should be heated as quickly as possible to the austenitic temperature range (830 °C – 860 °C) and required case depth followed by an immediate oil or water quenching, depending upon hardness required, workpiece size/shape and quenching arrangements.

Following quenching to hand warm, tempering at 150°C – 200°C will reduce stresses in the case with minimal effect on its hardness.

All de-carburized surface material must first be removed to ensure the best results.

Nitriding

Hardened and tempered 4340 alloy steel can also be nitrided, giving a surface hardness of up to Rc 60 - Heat to 500°C – 530°C and hold for sufficient time (from 10 to 60 hours) to develop the depth of the case.

Nitriding should be followed by slow cooling (no quench) reducing the problem of distortion.

The nitrided grade 4340 materials can therefore be machined to near final size, leaving a small grinding allowance only.

The tensile strength of the 4340 steel material core is usually not affected since the nitriding temperature range is generally below the original tempering temperature employed.

Surface hardness achievable is 600 to 650HV.

Machinability

It can be machined using all conventional techniques.

Machining process can be performed in the annealed or normalized and tempered conditions.

Welding

Welding of steel in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, because of the danger of quench cracking, as the mechanical properties will be altered within the weld heat affected zone.

If welding must be carried out, pre-heat to 200 to 300°C and maintain this while welding.

Immediately after welding stress relieve at 550 to 650°C, 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 °C below the original tempering temperature.

Our company provides various alloy steels.

Our alloy steels are of the best quality in terms of wear resistance, strength, corrosion resistance and high temperature resistance.

You are welcome to inquire and order, and there is nothing wrong with choosing us! ! ! Songshun specialized in Special Steel for almost 20 years.

We can supply mold steel, high speed steel, alloy steel, free cutting steel and etc.

Welcome your contact 24 hours a day!!!

+86-18269260283

Songshun Tiktok: mikizhuo

Songshun Facebook: Songshun Steel

Songshun YouTube: MiKi Zhuo

songshunsteel41404340


Company Contact:


  • Phone: 076985475596

  • Address: 1st Floor, No. 1, Dongda Fourth Street, Shatou Community, Chang'an Town, Dongguan , Guangdong , China

  • Email: Email


Published date: July 7, 2022

  • Business Description: Established in 2009,Songshun Steel supplies a wide range of carbon, alloy and tool steel products, including high speed tool steel, cold work tool steel, hot work tool steel, plastic mould steel, engineering steel and machine structural steel etc.

    After more than 10 years development and growing, Songshun Steel becomes one comprehensive special steel factory, stockist and exporter.

    Combined with experienced exporting team and professional technical knowledge, Songshun Steel offers both technical advice and support, as well as global professional steel solution and service.

    Due to satisfactory reliable quality and professional service, Songshun expands our market worldwide, such as Colombia, Chile, Spain, Turkey, Iran, Vietnam, Malaysia ,UAE, Canada, Brazil, Mexico and so on.

    Songshun specialized in Special Steel for almost 20 years.

    We can supply mold steel, high speed steel, alloy steel, free cutting steel and etc.

    Welcome your contact 24 hours a day!!!

    Skype/Whatsapp/We chat: +86-18269260283

    Songshun Tiktok: mikizhuo

    Songshun Facebook: Songshun Steel

    Songshun YouTube: MiKi Zhuo

    songshunmoldsteel414 04340

Related listings



  • Copper Casting
    Copper Casting
    Metal and mineral industries - Shandong Speed Steel Seiko Factory Co., Ltd. - China - July 7, 2022 - 1.00 Dollar US$

    Category:Copper alloy casting Copper casting, the copper appears rose red as a whole, and after an oxide film is formed on the surface, it appears purple, so it also called red copper.Copper is often used for electrical, thermal, and corrosion-resist...

  • Din 1 7225 Jis Scm440 Aisi Astm 4140 Round Bar Steel Product
    Din 1 7225 Jis Scm440 Aisi Astm 4140 Round Bar Steel Product
    Metal and mineral industries - Dongguan Songshun Mould Steel Co., Ltd. - China - July 7, 2022 - check with company for price

    Din 1.7225 jis scm440 aisi astm 4140 round bar steel product what is aisi 4140 steel? aisi 4140 alloy steel round bar sheet plate belongs to medium hardenability steel.aisi 4140 steel has high fatigue strength and low notch sensitivity. low-temperatu...

  • 1micron Silver Coated Copper Powder For Hjt Hit Paste
    1micron Silver Coated Copper Powder For Hjt Hit Paste
    Metal and mineral industries - Ningbo Guangxinnano Import And Export Co.,Ltd. - China - July 5, 2022 - contact company for price

    Application Apply to conductive paste, conductive printing ink, conductive resin, membrane switch and other intermediate and low-temperature paste, which can be instead of silver powder used in electronic industry. Features Uniform particle size Good...



Safe Trade Tips

  • Ask for business references and check them
  • Use a payment method that offers better protection for all such as Letters of credit and verified professional escrow services. Avoid payments in advance such as money transfers
  • Verify their business via their local Chamber of Commerce
  • Search the internet using their website address, their business name, their phone and fax numbers, and their email addresses to see if you can find any feedback about them.
  • Get to know more about scams and fraud to avoid: Internet Crime Complaint Center - Consumer Financial Protection Bureau
  • This site is never involved in any transaction, and does not handle payments, shipping, guarantee transactions, provide escrow services, or offer "buyer protection" or "seller certification"