42SiMn alloy structural steel

I Introduction

42SiMn alloy structural steel is a kind of low alloy medium manganese steel. It has strength, plasticity, toughness, fatigue strength and so on. It is widely used in light crane and heavy railway vehicle axle box, crane hook and other medium-sized components and parts.

II 42SiMn Steel Chemical Composition

The chemical composition of 42SiMn steel is: 0.37-0.44% of C, 1.15-1.50% of Mn, 0.17-0.37% of Si, 0.50-0.80% of Cr, 0.25-0.35% of Ni, 0.35-0.45% of Mo, and 0.40-0.55% of V.

III 42SiMn Steel Features

The 42SiMn steel has higher strength and better plasticity and toughness. It can be used for structural parts that bear static load. Its fatigue strength and high strength-to-weight ratio make it suitable for parts that bear dynamic loads. It also has good hardenability and corrosion resistance.

IV 42SiMn Steel Applications

42SiMn steel is widely used in the manufacture of medium and small friction discs, axles, wheel hubs, couplings and adjustable sleeves. Its low-alloy and low-carbon content make it an ideal material for rail vehicle transmission and axle driving shafts, which require high fatigue strength and good machinability. It is also used to produce various structural parts that bear static and dynamic loads, such as crane hooks and crane boxes of the medium crane.

V Heat Treatment of 42SiMn Steel

The pre-quenching temperature of 42SiMn steel is 900-950℃ and the pre-tempering temperature is 500-530℃. The heating temperature range for quenching is 950-1000℃, and the quenching medium is oil, water or brine. The range of tempering temperature is 550-580℃ and the tempering time is 2-4 hours.

VI Tips for Welding 42SiMn Steel

When welding 42SiMn steel, it is important to collocate an appropriate welding electrode. Generally, E301 and E407 welding electrodes are used because they have low hydrogen content, easy fusion, full penetration and good processability. Pre-heating is also important when welding this material; the pre-heating temperature is 350-550℃ and the interpass temperature is 250-450℃.

VII Conclusion

In conclusion, 42SiMn alloy structural steel is a kind of low alloy medium manganese steel with excellent properties. It has good strength, plasticity, toughness and good hardenability. It is widely used in many applications such as rail vehicle transmission and axle driving shafts, crane boxes and crane hooks etc. It is important to use the right welding electrode and adhere to the right pre-heating and interpass temperature when welding this material.

42SiMn Alloy Structure Steel

42SiMn alloy structure steel is a kind of Pearlite Heat Resisting steel with good plasticity, toughness and welding performance. This steel can perform higher intensity tired of structure and machine parts, performing quenched and tempered treatment and improving its physical properties, such as tensile strength, yield strength, elongation and impact absorption energy.

42SiMn alloy structure steel is composed of material composition and quenching and tempering technical requirements. The material composition are C ≥0.32%, Si ≥1.1%, Mn≤1.2%, P ≤0.035% and S ≤0.035%, and the quenching and tempering technical requirements are: impact energy ≥ 64J, hardenability ≥ 165HBS and hardenability ≥ 25HBS.

The mechanical properties of 42SiMn alloy structure steel are as follows: tensile strength σb≥800MPa, yield strength σs≥680MPa, elongation rate δ5≥10%, reduction of area ψ≥45%, tougheness hook Kv≥47J, impact energry Akv≥64J.

The hardness of 42SiMn alloy structure steel after quenching is HRC 28-34. The hardness after tempering can be as low as HRC20-23. The good low alloy structure steel should be able to bear high impact load without fractu re or permanent deformation under normal working stress. It also has good weldability, which can be used to manufacture components with complex shapes.

The scope of application of 42SiMn alloy structure steel is mainly used for the manufacture of important machine parts which require large size and high strength, such as pressure vessels and molds for engineering. In addition, it can also be used to manufacture components requiring high-speed and low-temperature performance, such as turbine blades.