Detailed Photos
Product Description
Round steel is a kind of hollow cylindrical metal material, which is widely used in construction, machinery manufacturing, automobile manufacturing, energy, transportation and other industries.
Round steel is mainly made of carbon steel, alloy steel and tool steel.
Among them, carbon steel round steel refers to steel with carbon content within the range of 0.20% to 0.55%.
Carbon steel round steel is an economical and practical structural material with good weldability, plasticity and machinability
Alloy steel round steel refers to the steel with a certain amount of alloying elements (chromium, manganese, cobalt, boron, molybdenum, vanadium, etc.), which can obtain higher strength, hardness, corrosion resistance and wear resistance.
Tool steel Round steel is a kind of high-speed tool steel material, which has the advantages of high hardness, high red hardness and wear resistance.
Therefore, the material characteristics of round steel are very different from the scope of application.
1. 42CrMo4 steel equivalent grade:
| 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 |
| 42crmo4 |
2. 42CrMo4 steel 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 | 0.04 | 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 |
| 1.7225 | |||||||||
| 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 |
3. 42CrMo4 steel mechanical properties:
(Different Property canbe catched by adjusting Quenched and Temepering tempreture and time )
|
Yield Strength (MPa) |
Tensile Strength (MPa) |
Elongation |
Reduction of area |
AKV (J) |
|
930 min |
1080 min |
12% min |
45% min |
63 min |
4. 42CrMo4 steel applications:
high strength stud bolt, threaded rods, wind power bolt, prestressed anchor bolts, post stressed anchor bolt, steel tie rod, tie bar, tension rod, tension bar etc. Shaft, axle shaft, crankshaft, shaft for sleeve, linear shaft, pump shaft, rotor shaft, sensor shaft, spline shaft, drive shaft, mandrel shaft, transmission shaft, screw rod etc. CNC machines, precision CNC machines etc. Ejector pins and Ejector rods
5.Supply Size range
| Delivery condition | Diameter ranges |
| Hot tolled | M12-M310 |
| Hot rolled+Q&T(Quenched and tempered) | M12-M310. |
| Cold drawn +Q&T(Quenched and tempered) | M10-M100 |
| Peeled / Peeled+Q&T | M10-M100 |
| Forged/Forged+Heat treatment. | M250-M1000 |
6.Product Features:
1. High strength and toughness.
2. Great property of quenching and can be deep hardened.
3. Less tempering brittleness tendency.
4. Great machining performance under high temperature and nice appearance after machining.
5. Good performance in weld ability.
6. Excellent performance in impact absorption, such as where the hammer may bounce back and has barely any damage caused upon impact.
| Special Steel Round Bar | Grade |
Spec |
Dimension |
Steel Grade |
Application industry |
| Quality carbon structural steel | GB/T699 JIS G 4051 ASTM A29 SAE,EN10083 (Others) | 12-260 | 10# ,20#,45#, 65Mn,SAE1080,S45Cetc | ,,,For Manufacturing of All Kinds of Bearing Parts, Connecting Rod. Rigging Metal Tools etc. |
|
| Low alloy high-strength steel | GB/T1591,(Others | 13-260 | Q355 series,Q460Cetc | ,, Mechanical,Car,Engineering machinery | |
| Alloy structural steel | GB/T3077,JIS,ASTM A29, EN10083,(Others) | 13-260 | 20Mn2-45Mn2,25MnV,27SiMn-42SiMn,20Cr-40Cr,12CrMo-42CrMo,20CrMn,40CrMn,SCr420,SCr440,SCM420,SCM440,41Cr4,20CrMoA,30CrMoA,20Cr2MoA,20CrNiMo,20Cr2Ni4A,SAE4340,20Cr2Ni4A,30CrMnSiA etc | ,,, Mechanical,Car,Bridge,Petrochemical industry | |
| Bearing steel | GB/T 18254,(Others) | 14-200 5-25 wire rod and cold drawn wire |
GCr15,GCr15SiMn,C&U1,C&U2,GCr15-JN,SCP52100,SCPSS52100,GCr15S700,100CrMn6,SUJ2,SUJ2S1,SAE1055,S55C,G20CrNiMoA(SAE8620),GCr15etc | ,,, Mechanical ,Car ,Electric machinery,Engineering machinery etc | |
| Spring Steel | GB/T1222,JIS,SAE,EN,(Others) | 13-120 | 60Si2MnA,60Si2CrA,60Si2CrVA,55CrMnA,50CrVA,SUP9, SUP9A ,SUP11A, 55Cr3 ,51CrV4 ,52CrMoV4 ,SAE5160 SAE6150 ,SAE9254, 60SiCrVAT, 52CrMoV4 ,55SiCr etc | ,, Car,High Speed railway,Locomotive |
|
| Round billet | 300mm-600mm ( According to the different requirement) | ||||
| Large section bar | 80mm-350mm ( According to the different requirement) | ||||
| Forging | 180mm-1500mm ( According to the different requirement) | ||||
Packing & Delivery
1.What is a round bar?
Round bar is exactly as it sounds; a long, cylindrical metal bar. Round bar is available in a variety of metals including black steel, bright steel, stainless steel, aluminium, engineering steel, brass and more; and in many different diameters ranging from 1/4″ up to 24". Steel Round Bars.
2.What size is a round bar?
Round bars can range from as thin as 1/8 inch (3mm) in diameter to more than 12 inches (300mm) for specialized uses. The most common sizes usually fall between 1/4 inch (6mm) and 2 inches (50mm).
3.What is the difference between a round bar and a rod?
Round bars often possess higher tensile strength and hardness, making them suitable for load-bearing applications. Meanwhile, rods offer increased flexibility and are more malleable, catering to intricate designs and bending requirements.
4.Which is better, SS or MS?
Fabrication. As chrome is a hard alloy, stainless steels are much more impact resistant compared to mild steel and (although relatively easy to fabricate) are not as easy to fabricate as mild steel. Mild steel is much more malleable compared to stainless and so is used a lot in general fabrication.
5.How strong is a round bar?
Compressive Strength
Round Bars: Round bars handle compressive loads very well because their shape helps distribute stress evenly. This makes them especially good for applications where the pressure is centred, as it helps them resist bending or deforming under heavy loads.