China Specialty Steel Supplier
4140/42CrMo4/42 CrMoS4 Alloy Steel
AISI 4140 alloy steel is a chromium-, molybdenum-, and manganese-containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength.
Common 4140 Steel Specifications
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 | SCM440 | 42CrMo | 4140 |
4140 Steel Bar Chemical Composition
Standard | Grade | C | Mn | P | S | Si | Ni | 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/ | 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
The following table outlines the mechanical properties of AISI 4140 alloy steel.
Properties | Metric | Imperial |
Tensile strength | 655 MPa | 95000 psi |
Yield strength | 415 MPa | 60200 psi |
Elongation at break (in 50 mm) | 25.70% | 25.70% |
Hardness, Brinell | 197 | 197 |
AISI 4140/42CrMo4/42 Steel Welding
When welding AISI 4140 steel, preheating the material is crucial to ensure successful joining of two pieces. Proper preheating helps prevent cracking and ensures the weld is strong and durable.
AISI 4140/42CrMo4/42 steel can be welded using various methods including Stick welding, TIG welding, and MIG welding. Each method requires different techniques and equipment, but all can produce a good quality weld if properly performed.
The selection of the welding method depends on several factors such as the thickness of the material, the type of joint, and the required strength of the weld. It is important to choose the appropriate welding method that best suits the specific application and follow proper welding procedures to ensure a high-quality weld.
Forging
Preheat the steel carefully, heat to 1150 ℃ – 1200 ℃ maximum, hold until temperature is uniform throughout the section.
Do not forge below 850℃. Following forging operation the work piece should be cooled as slowly as possible.
AISI 4140 Steel Grade Heat Treatment
- Annealing
Heat ASTM 4140 steels to 800 ℃– 850 ℃, hold until temperature is uniform throughout the section and cool in furnace. - Normalizing
Heat steel alloy 4140 to 870 ℃– 900 ℃, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes and cool in still air. - Tempering
Re-heat 4140 grade steel to 550 ℃– 700 ℃ as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.
Application
This alloy finds many applications as forgings for the aerospace and oil and gas industries, along with myriad uses in the automotive, agricultural and defense industries.
Typical uses are forged gears and shafts, spindles, fixtures, jigs and collars.
Wholesale Price
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Qilu steel has two big warehouses ,one of them is located in Wuxi ,Jiangsu province .We have more than 12,000 tons of inventory, covering alloy steel,tool and die steel, stainless steel and other steel products in different sizes.We also provide different shapes of them which include
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Qilu has a large stock of rolled and forged bars from Dongbei Special Steel ,Shi-Steel ,Huai-Steel with a short delivery time .We also stock other products which can cover carbon steel ,alloy steel ,tool and mould steel,stainless steel in different shapes and sizes.Our stock of steel exceeds 12,000 tons all year round.
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Shandong Qilu lndustrial Co.,Ltd.established from the year of 1985，we are engaged in supplying forged steel products.Having a full line service from smelting,forging,heat treatment,surface process to logisitics.We’ve served of customers in abroad and domestic market,familiar with the standards in different countries.Since 2016,we’ve to broaden our range of products，invested a forged products factory and set up two main warehouses aiming to provide a better service relating steel products.
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