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Alloy High Tensile Hot Rolled Steel Bar Round Shape 12 - 320mm AISI / SAE 4140
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Brand Name:UST
Model Number:ASTM 4140
Certification:ISO 9001:2008
Price:USD 800-2000 / Metric Ton
Payment Terms:L/C, T/T, D/A, D/P
Supply Ability:1000 Metric Tons per Month
Delivery Time:15-35 days
Company Data
Active Member
Contact Person
Eric
Business Type:
86-21-35316960
Business Type:
Manufacturer Distributor/Wholesaler Agent Exporter Trading Company Seller
Officials:
Room 1109, Loft Office, Green Land International Plaza, No. 275-8 Guoding East Road, Shanghai 200433, P.R. China. (admin(a)shunitesteel.com)
Quality:
Quality Certifitation Available
Product Details
Company Profile
Product Details
AISI / SAE 4140 Hot Rolled Alloy High Tensile Steel Bar / Rod 12-320mm
INTRODUCTION
Alloy Steel 4140, also sold under the name AISI/SAE 4140, is a low alloy steel that contains chromium, molybdenum, and manganese. Known for its impact and abrasion resistance, Alloy Steel 4140 also offers users outstanding fatigue and torsional strength. Welding is possible through most popular techniques, and it has a high level of ductility. Machinability is possible in the annealed condition, while Alloy Steel 4140 takes cold working, heating, and quenching well.
APPLICATIONS
Due to its toughness and other positive characteristics, Alloy Steel 4140 is found in a wide variety of applications such as:
- Axle shafts
- Bolts
- Crankshafts
- Hydraulics
- Torsion bars
- Tool Holders
SUPPLY RANGE OF ALLOY 4140
-Dimension: Diameter 4-1600 mm, any length below 16 meters
-Delivery Conditions:
Cold drawn: 4-100 mm
Peeled: 30-160 mm
Grinded: 4- 600 mm
Turned: 130-1200 mm
Hot rolled: 12-320 mm
Hot forged: 130-1600 mm
-EAF+(ESR) or EAF+LF+VD+(ESR)
-HOT rolled; Cold rolled; Forged; Cold Drawn
-Heat Treatment: Untreated, Annealing, N+T, Q+T
-Smelting: EAF+LF+VD (+ESR)
-Surface Finish: Black, Rough Machined, Peeled, Turned or upon request
-UT 100% passed
-Cutting service provided
-Third Party inspection is acceptable (SGS, BV etc.)
COMMON 4140 STEEL EQUIVALENCY
| Country | USA | German | British | Japan | China | Australia |
| Standard | ASTM A29 | DIN 17200 | BS 970 | JIS G4105 | GB/T 3077 | AS 1444 |
| Grades | 4140 | 1.7225/ 42crmo4 | 42CrMo4 | SCM440 | 42CrMo | 4140 |
4140 STEEL BAR CHEMICAL COMPOSITION
| Standard | Grade | C | Mn | P | S | Si | Cr | Mo |
| ASTM A29 | 4140 | 0.38-0.43 | 0.75-1.00 | 0.035 | 0.040 | 0.15-0.35 | 0.8-1.10 | 0.15-0.25 |
| EN 10250 | 42CrMo4/ 1.7224 | 0.38-0.45 | 0.6-0.9 | 0.035 | 0.035 | 0.4 | 0.9-1.2 | 0.15-0.30 |
| JIS G4105 | SCM440 | 0.38-0.43 | 0.60-0.85 | 0.03 | 0.03 | 0.15-0.35 | 0.9-1.2 | 0.15-0.30 |
MECHANICAL PROPERTIES OF AISI ALLOY 4140 STEEL BAR
| Properties | Metric | Imperial |
| Tensile strength | 655 MPa | 95000 psi |
| Yield strength | 415 MPa | 60200 psi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 25.70% | 25.70% |
| Hardness, Brinell | 197 | 197 |
| Hardness, Knoop (converted from Brinell hardness) | 219 | 219 |
| Hardness, Rockwell B (converted from Brinell hardness) | 92 | 92 |
| Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) | 13 | 13 |
| Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
| Machinability (based on AISI 1212 as 100 machinability) | 65 | 65 |
Machining
AISI 4140 has good machinability. Operations such as turning,
hobbing, drilling, sawing, broaching, tapping and milling can be
easily performed using the recommendations provided by the
machine's manufacturer for ideal tool type-feeds and speeds. AISI
4140 has the following properties:
- Machinability rating at 66% of B1112
- Average cutting speed of 110 ft/min.
Weldability
AISI 4140 is difficult to weld, but welding can be performed using
any of the common welding practices. Welding can be done by
preheating the section and ensuring that stress relieving takes
place after welding. It is basically recommended that welding of
AISI 4140 steel in the hardened and tempered condition should be
avoided as it changes the mechanical properties within the weld
heat affected zone. Likewise welding in the nitrided, flame or
induction hardened condition is not recommended. However welding of
AISI 4140 chrome-molybdenum steel in the annealed condition is
widely preferred. In case welding in the hardened and tempered
condition is required, the workpiece must be cooled instantly and
the stress is relieved at 15°C below the original tempering
temperature.
When welding AISI 4140 steel (in any condition) only low hydrogen electrodes should be used.
Follwoing welding, the maximum cooling rate that should be employed is 95°C /hr down to 95°C. This should be followed by cooling in still air. The cooling rate can be slowed by wrapping the work piece in a heat resistant blanket or burying it in sand.
Heat Treatment
There are various heat treatments of the AISI 4140
Chrome-Molybdenum High Tensile Steel which are: Forging; Stress relieving; Annealing; Normalizing; Nitriding;
Tempering; Flame and induction hardening; Hardening.
Forging
Can be heated to 1150°C and maintained until uniform
Minimum forging temperature 850°C
Can be cooled slowly in sand or ash
Stress Relieving
Hardened: Heat to 500°C – 550°C
Annealed: Heat to 600°C – 650°C
Cool in still air
Annealing
Heat to 830°C – 850°C
Furnace cool
Normalizing
- Heat to 870°C – 900°C
- Cool in still air
Nitriding
- Heat to 500°C – 530°C and hold for sufficient time to develop the depth of case required
- Parts should be pre-hardened and tempered as required and also
pre-machined leaving a small grinding allowance only.
Tempering
- Heat to 450°C – 700°C cool in still air
- Tempering in the range of 200°C – 420°C causes temper brittleness and should be avoided
Flame and Induction Hardening
All materials consisting of de-carburized surfaces should be removed to ensure best results.
- Heat quickly to the required case depth at 860°C – 890°C and soak instantly in water or oil
- Tempering at 150°C – 200°C helps reduce stresses in the case with
marginal effect on its hardness
Hardening
- Heat to 830°C – 880°C
- Soak in oil or polymer
What we can offer?
-We offer a wide range of steel products in a wide variety of dimensions and executions, according to the common international specifications or customize.
-Machining and heat treatment are available.
-Also, we advise you in choosing the right materials.
Shape Available
- Solid round bar
- Flat bar
- Square bar
- Hexagon bar
- Block
- Plate
- Sheet
- Wire rod
- Strip
Our Advantages
- High mechanical property and quenching, enable the surface share equal hardness after deal with it
- Good polishing and low roughness
- Making the heat-treatment to harden condition before using it
- Competitive price
- Fast production lead-time
- All the material are inspected with 3 times to meet the highly standards
- Pure steel quality & stable quality to be guarantee
OUR MAIN PRODUCTS ARE LISTED AS BELOW
Notes:
Available Size:
-Round: Dia. 4-1600 mm
-Flat: T. 10-120 mm x W. 60-810 mm
-Block: T. 80-1200 mm x W. 100-1600 mm
PAYMENT AND SHIPPING
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
COMPANY INFORMATION
Shanghai Unite Steel Trading Co., Ltd
We 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.
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!
FAQ
Q: Are you a manufacturer or merely a trader?
A: We are group of companies and owned manufacturer bases and
trading company. We specialized in special steel which include
alloy structural steel and carbon steel and stainless steel, etc.
All material are with high quality and competitive price.
Q: How do you guarantee the quality of your product?
A: Firstly, we can provide the certificates from the third party,
such as TUV, CE, if you need. Secondly, we have a complete set of
inspection system and every process is checked by QC. Quality is
the lifeline of enterprise survival.
Q: Delivery time?
A: We have ready stock for most of material grades in our
warehouse. If the material doesn't have stock, the delivery lead
time is about 5-30 days after receiving your prepayment or firm
order.
Q: What is the payment term?
A: T/T or L/C.
Q: Can we visit your company and factory?
A: Yes, warmly welcome! We can book the hotel for you before you
come to China and arrange our driver to our airport to pick you up
when you come.
Company Profile
SHANGHAI UNITE STEEL
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!
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