42CrMo4 QT Hot Rolled Alloy Steel Round Bar
Product Information Introduce
4140 alloy structural steel. This steel has good workability and small processing deformation. The fatigue resistance of 4140 alloy structural steel is quite good. It is a medium-sized hardenable steel. 4140 has good strength and good comprehensive mechanical properties after heat treatment. Good manufacturability and high yield. The highest operating temperature is 427 degrees Celsius. 4140 strength, high hardenability, good toughness, small deformation during quenching, high creep strength and enduring strength at high temperatures.
4140 steel is ultra-high-strength steel with high strength and toughness, good hardenability, no obvious temper brittleness, high
fatigue limit and multiple impact resistance after quenching and tempering, and good low-temperature impact toughness. 4140 steel
is suitable for manufacturing large and medium-sized plastic molds that require certain strength and toughness.
Mechanical properties
Hardness: Annealed, 147~241HB, 42CrMo
4140 mechanical properties:
Tensile strength σb (MPa): ≥1080(110)
Yield strength σs (MPa): ≥930(95)
Elongation δ5 (%): ≥12
Reduction of area ψ (%): ≥45
Impact energy Akv (J): ≥63
Impact toughness value αkv (J/cm2): ≥78(8)
Hardness: ≤217HB
In order to increase the mold life to more than 800,000 mold times, the hardening method of quenching and low temperature
tempering can be implemented on the pre-hardened steel. When quenching, preheat it at 500-600ºC for 2-4 hours, then keep it at
850-880ºC for a certain period of time (at least 2 hours), put it in oil and cool to 50-100ºC and air cooling, the hardness can
reach 50 after quenching -52HRC, in order to prevent cracking, 200ºC low temperature tempering treatment should be carried out
immediately. After tempering, the hardness can be maintained above 48HRC.
Corresponding grade
Russia ГOCT 38XM, the United States AISI 4140/4142, the United Kingdom BS 708M40/708A42/709M40, France NF 40CD4/42CD4, Germany DIN
41CrMo4/42CrMo4, Japan JIS SCM4, international ISO 683/1 3
Quenching specification
Common quenching and tempering specifications: quenching temperature 1000~1050ºC, quenching oil or quenching gas, hardness ≥ 60HRC;
tempering temperature 160~180ºC, tempering time 2h, or tempering temperature 325~375ºC, number of tempering 2 ~3 times.
Process specification
Hot working specification
The heating temperature is 1150 ~1200°C, the starting temperature is 1130 ~1180°C, and the ending temperature is> 850°C, when φ>
50mm, slow cooling.
Normalizing norms
The normalizing temperature is 850~900°C, and the furnace is air-cooled.
High temperature tempering specification
The tempering temperature is 680~700°C, and the furnace is air-cooled.
Quenching and tempering specifications
Preheating temperature is 680~700°C, quenching temperature is 840~880°C, oil cooling, tempering temperature is 580°C, water
cooling or oil cooling, hardness ≤217HBW.
Specification for sub-temperature quenching strengthening and toughening treatment
Quenching temperature 900°C, tempering temperature 560°C, hardness (37±1) HRC
Specification for induction hardening and tempering
The quenching temperature is 900°C, the tempering temperature is 150~180°C, and the hardness is 54~60HRC.
Product Description
|
Product name |
steel round bar |
|
Size |
O.D |
8-480mm |
|
Length |
1-12m |
|
Standard |
AISI,ASTM,GB,DIN,BS,JIS |
|
Grade |
42CrMo4, 4140 |
|
Inspection |
X-ray inspection, manual ultrasopic inspection,surface inspection,hydraulic testing |
|
Technique |
Hot Rolled |
|
Section Shape |
Round |
|
Main Market |
Southeast Asia, Middle East, Australia,USA,South America,Africa |
|
Productivity |
5000 Tons/month |
|
Packing |
Standard bundle package Beveled end or as per request |
|
Surface Treatment |
Black Painted, PE Coated, Galvanized or Customized all available |
|
Date of Delivery |
According to The Specifications And the Quantities Of Each Contract,
Time Start To Begin When We confirm the Date of the Earnest or L/C |
|
Method of Payment |
T/T L/C |
|
Method Of Delivery |
Terms According To the <INCOTERMS 2000> for International Trading |
|
Remarks |
1.Payment Terms T/T, L/C |
|
2.Trade Term:FOB/CFR/CIF |
|
3.Minimum Quantity of Order: 2 Tons |
|
4.Delivery Time:7-15 days after receipt of deposit |
Product Shows:
Produce Process
Packing&Delivery
MOQ: 25 Ton
Terms of delivery: FOB, CFR, CIF.
Terms of payment: L/C, T/T.
Port of Loading: Tianjin/ Shanghai,China
Quantity of stock: Normally have large quantity stocks.
Time of delivery: 10-25 days for batch goods.Normally delivery in 20 days from production
Package Informations: Seaworthy Packing or as required
Application
Why Choose Us?
Our advantages:
1. More than 10 years Professional steel export service. Have own production line.
2. Advanced CNC machine.
3. Low cost&Quick Delivery&High quality.
4. Integrity, strength and quality of products recognized by the industry.
5. Most of our clients are international, the domestic well-known enterprises.
6. Has a complete scientific quality management system.
7. Can meet any requirements for all kinds of sheet metal processing with advanced equipment.
FAQ
Q1: How can I get a sample to check your metal work quality?
Answer: After price confirmation, you can require for samples to check our quality. We will provide you sample for free (value under USD35), as long as you afford the express freight.
Q2: How long can I expect to get the metal work sample?
Answer: After you pay the sample charges(if there is) and send us confirmed drawings, the sample will be ready for delivery in 5-7 working days. The samples will be sent to you via DHL, FedEx,UPS,TNT or EMS. It should arrive in 3-5 workdays. You can use your own express account or prepay us if you don't have any account.
Q3: What about the leading time for metal work mass production?
Answer: Honestly, it depends on the order quantity. Normally, 15 workdays to 30 workdays after your deposit if no the samples are confirmed.
Q4: What will we do if the metal work quality is not ok ?
Answer: If the quality problem is caused by our mistake, we will make replacement order for free or pay the back product charge and handling charge back to you.
More questions, please send us the email to us
Audited Supplier 
){kind=link}