AISI 4140 1.7225 42CrMo4 SCM440 B7 Steel Bar
Short Description:
AISI SAE 4140 alloy steel is a chromium molybdenum alloy steel specification widely used in general purpose high tensile steel for components, like axles, shafts, bolts, gears and other applications.
Carbon Steel Bars:
AISI 4140, 1.7225 (42CrMo4), SCM440, and B7 Steel Bar are different designations for essentially the same type of alloy steel. They are known for high strength and toughness, commonly used in applications like gears and bolts. AISI 4140 is the American designation, 1.7225 is the European EN standard, SCM440 is the Japanese JIS designation, and B7 refers to a grade meeting ASTM A193 specifications. These designations represent a chromium-molybdenum alloy steel with similar properties, and the choice may depend on regional or industry standards.
Specifications Of 4140 1.7225 42CrMo4 SCM440 B7:
| Grade | 4140 1.7225 42CrMo4 SCM440 B7 |
| Standard | ASTM A29,ASTM A193 |
| Surface | Black, Rough Machined, Turned |
| Diameter Range | 1.0 ～ 300.0mm |
| Length | 1 to 6 Meters |
| Processing | Cold Drawn & Polished Cold Drawn, Centreless Ground & Polished |
| Raw Materail | POSCO, Baosteel, TISCO, Saky Steel, Outokumpu |
Features & Benefits:
• High Strength: These steel bars exhibit high tensile strength, making them suitable for applications where strength and durability are critical.
• Toughness: They offer good toughness and impact resistance, making them capable of withstanding heavy loads and dynamic stresses.
• Versatility: AISI 4140, 1.7225, 42CrMo4, SCM440, and B7 are versatile alloys suitable for a wide range of applications, including gears, bolts, shafts, and structural components.
• Wear Resistance: The alloying elements, such as chromium and molybdenum, contribute to improved wear resistance, making these steel bars suitable for applications subject to abrasive conditions.
• Machinability: These steels have good machinability when properly heat-treated, enabling efficient machining processes during fabrication.
• Weldability: They can be welded, although preheating and post-weld heat treatment may be required to maintain the desired properties and avoid issues such as brittleness.
Chemical Composition :
| Grade | C | Mn | P | S | Si | Cr | Mo |
| 4140 | 0.38-0.43 | 0.75- 1.0 | 0.035 | 0.040 | 0.15-0.35 | 0.8-1.10 | 0.15-0.25 |
| 42CrMo4/ 1.7225 |
0.38-0.45 | 0.6-0.90 | 0.035 | 0.035 | 0.40 | 0.9-1.20 | 0.15-0.30 |
| SCM440 | 0.38-0.43 | 0.60-0.85 | 0.03 | 0.030 | 0.15-0.35 | 0.9-1.20 | 0.15-0.30 |
| B7 | 0.37-0.49 | 0.65-1.10 | 0.035 | 0.040 | 0.15-0.35 | 0.75-1.20 | 0.15-0.25 |
Mechanical properties :
| Grade | Tensile Strength [MPa] | Yiled Strengtu [MPa] | Elongation % |
| 4140 | 655 | 415 | 25.7 |
| 1.7225/42CrMo4 | 1080 | 930 | 12 |
| SCM440 | 1080 | 930 | 17 |
| B7 | 125 | 105 | 16 |
FAQ Guide:
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4140 vs 42CRMO4 – What’s the Difference?
AISI 4140 and 42CrMo4 are essentially the same type of steel, with AISI 4140 being the American designation and 42CrMo4 being the European designation. They share similar chemical compositions, high strength, and toughness, making them suitable for applications like gears and bolts. Despite different designations and regional standards, they are often considered interchangeable due to comparable properties.
What is 42CrMo4 steel?
42CrMo4 is a chromium-molybdenum alloy steel designated by the European standard EN 10083. It is known for its high strength, toughness, and good hardenability. With a carbon content of 0.38% to 0.45%, it is commonly used in applications requiring robust components, such as gears, crankshafts, and connecting rods in industries like automotive and aerospace. The steel responds well to heat treatment, providing the ability to adjust mechanical properties, and it is considered an international equivalent to other designations like AISI 4140 and SCM440.
What is grade B7 steel?
Grade B7 is a specification within the ASTM A193 standard, which covers high-strength bolting materials for use in high-temperature or high-pressure service. ASTM A193 is a standard developed by ASTM International (formerly known as the American Society for Testing and Materials) and is widely used in the oil and gas, petrochemical, and power generation industries.Grade B7 steel is a low-alloy chromium-molybdenum steel that is quenched and tempered (heat-treated) to achieve the desired mechanical properties.It's important to note that Grade B7 steel is often used in combination with Grade 2H nuts to ensure compatibility and performance in demanding applications. When specified, materials must meet the requirements outlined in the ASTM A193 and A194 standards to ensure proper strength, ductility, and other mechanical properties.
Our Clients
Feedbacks From Our Clients
AISI 4140, 1.7225, 42CrMo4, SCM440, and B7 steel bars respond well to heat treatment, allowing for the adjustment of mechanical properties such as hardness and toughness.These steel bars exhibit high tensile strength, making them suitable for applications where strength is a critical factor.They offer good toughness and impact resistance, making them capable of withstanding heavy loads and dynamic stresses.The steel bars are versatile and find applications in various industries, including automotive, aerospace, construction, and manufacturing.The alloying elements, such as chromium and molybdenum, contribute to improved wear resistance, making these steel bars suitable for applications subjected to abrasive conditions.
Packing:
1. Packing is quite important especially in a case of international shipments in which consignment pass through various channels to reach the ultimate destination, so we put special concern regarding packaging.
2. Saky Steel's pack our goods in numerous ways based on the products. We pack our products in multiple ways, such as,
