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AISI 4140 Steel Bar Hot Rolled Alloy Steel Round Bar 4140 steel round bar

1000 Kilogram
$0.60 / Kilogram
AISI 4140 Steel Bar  Hot Rolled  Alloy Steel Round Bar  4140 steel round bar
Features Gallery Product Description Request A Quote
Steel Grade: 4140
Alloy Or Not: Is Alloy
Technique: Hot Rolled
Application: Structural Steel Bar,Die Steel Bar,Tool Steel Bar
Shape: Round
Length: 1m-6m,as Your Request
Material: Die Alloy Steel Round Bars
Surface: Black Or Bright
Product Name: Alloy Steel Round Bar 40Cr 4140 D2 Alloy Steel Round Bars
Diameter: 12mm-650mm
Delivery Condition: Within15 Days After Received The Deposit
Basic Infomation
Place of Origin: Tianjin
Brand Name: Gnee
Certification: SGS
Model Number: 4140
Payment & Shipping Terms
Packaging Details: Steel strip packed,Standard Export Seaworthy Package.Suit for all kinds of transport,or as required
Payment Terms: L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability: 1000 Ton/Tons per Month
Product Description
AISI 4140 Steel Bar  Hot Rolled  Alloy Steel Round Bar  4140 steel round bar
Steel Grade AISI 4140/DIN 1.7225/JIS SCM440/GB 42CrMo
Size & Dimension Dia:20-120mm L:2000-5800mm
Surface treatment Black/Peeling/Polishing/Machined
Technique Cold/Hot rolled, Cold-Drawn or Hot Forged
Heat Treatment Annealed; Quenched; Tempered
Delivery Condition Hot Rolled or Forged/Peeled or Black Surface/Annealed or QT
Test SGS/UT100%/Elements Testing
Certificate ISO/Mill Certificate
AVAILABLE Steel Type Round bar/Plate



C Si Mn P S Cr Mo V Ni Other
0.38-0.45 0.17-0.37 0.50-0.80 ≤0.035 ≤0.035 0.90-1.20 0.15-0.25 - - -



Round bar: Diameter(mm) Max 800mm; Length(mm) Max 12000mm.

Plate: Thickness(mm) Max 800mm; Width(mm) Max 2300mm; Length(mm) Max 12000mm.

Condition: Cold rolled(drawn)≤50mm, Hot rolled≤12-250mm, Hot forged≥50mm.


AISI 4140/DIN 1.7225 Introduction:

AISI 4140 alloy steel is chromium, molybdenum, manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength.


Fabrication and Heat Treatment:


1. Forging

Preheat the steel carefully, then raise the temperature to 1150-1200°C for forging. Do not forge below 850°C.


2. Annealing

Heat the AISI 4140 slowly to 800-850°C and allow enough time for the steel to be thoroughly heated. Cool slowly in the furnace to 480°C followed by air cooling.


3. Stress Relieving

When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening.


4. Hardening

AISI 4140 steel is usually supplied ready heat treated to 18-22HRC. If further heat treatment is required annealed AISI 4140 should be heated slowly to 840-875°C and after adequate soaking at this temperature quench in oil. Temper as soon as the tools reach room temperature.


5. Tempering

Heat the AISI 4140 carefully to a suitable temperature selected by reference to a tempering chart or table (usually between 550-700°C, soak at the temperature for 2 hours per 25mm of ruling section, then allow to cool in air. Tempering between 250-375°C is not advised as tempering within this range will seriously reduce the impact value.


6. Surface Treatment

Plate: Origin Black, Orign cold rolled bright, Machined, Grinded

Bar: Origin Black, Orign cold rolled(drawn) bright, Turned, Peeled, Grinded


AISI 4140 Steel Bar  Hot Rolled  Alloy Steel Round Bar  4140 steel round bar

Our Service

(1) Professional production and wholesale of products with high quality and at reasonable prices to reduce the intermediate links and yield the profits to front line customers!

(2) Customers may specify at discretion the desired length of steel or other requirements!

(3) Gas cutting, sawing, laser cutting and other ancillary services are provided upon request!

(4) Every process will be checked by responsible QC which insures every product's quality.

(5) Professional packing teams which keep every packing safely.

(6) We run business as usual on holidays to shorten lead time!

(7) The Company engages in overall tracking of the quality of the steel sold by us to dismiss your concerns!

(8) The steel materials supplied by the Company are accompanied with the original material certificates issued by the steel mills!

(9) Samples can be provided as your requirements

Q: Where is your company ?
A: Our company located in Tianjin China.

Q: How long is your delivery time?
A: Generally is 10-15 workingdays of goods in stock, or 20-30 days if goods are not in stock, it is according to quantitiy.

Q: Do you provide samples? is it free or extra?
A: Yes, we could offer the sample for free charge.but the customers have to pay the sample courier cost.

Q: What is your terms of payment?
A: We supports L/C,D/A,D/P,T/T ,Paypal payments. We'll show you the photos of the products and packages before you pay the

Q. Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery.

Q: How do you make our business long-term and good relationship?
A: We keep good quality and competitive price to ensure our customers benefit.
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Get in touch with us
Tel : +8615824687445
Fax : 86-372-5055135
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