40Mn2 structural steel pipe is a medium carbon quenched and tempered manganese steel. The strength, plasticity and wear resistance of the steel are high, and the machinability and heat treatment process performance are also good. The critical hardenable diameter in oil is 8.5~23mm, and in water The critical hardened diameter reaches 20~42mm; however, it has temper brittleness and overheating sensitivity, and is prone to cracking during quenching. This steel has white spot sensitivity, low cold deformation plasticity, and poor weldability. It needs to be preheated to 100~425℃ before welding.
45Mn2 medium carbon quenched and tempered steel pipe has high strength, wear resistance and hardenability. The critical hardenable diameter in oil reaches 10~25mm, and the critical hardenable diameter in water reaches 22~45mm.
| Outer Diameter | 21.3mm-660mm |
| Wall Thickness | 0.5mm-20mm |
| Dia Tolerance | Control with in the standard, OD:±1%, WT:±10% |
| Materials | 10#, 20#, 45#, Q235, Q345, Q195, 40mn2 ,45mn2 |
| Zinc coating | Pre galvanized steel pipe: 60-150g/m² Hot dipped galvanized steel pipe: 200-400g/m² |
| Inspection | ISO, BV, SGS, MTC |
| Packing | Steel strip packed. Standard Export Seaworthy Package. Suit forall kinds of transport,or as required |
| Application | Accessorize, machinery parts, structure steel pipe, piling pipe, sewage and clear water transportation, Line pipe for petroleum and so on |
structural carbon steel pipe
Chemical composition of 45mn2 steel pipe (mass fraction) (%)
Carbon C:0.42~0.49
Silicon Si:0.17~0.37
Manganese Mn:1.40~1.80
Sulfur S: Allowable residual content ≤ 0.035
Phosphorus P: Allowable residual content ≤ 0.035
Chromium Cr: Allowable residual content ≤ 0.030
Nickel Ni: Allowable residual content ≤0.030
Copper Cu: Allowable residual content ≤0.030
40mn2 chemical composition (mass fraction) (%)
Manganese Mn: 1.40～1.80
Phosphorus P: ≤0.030 (residual content)
Sulfur S: ≤0.030 (residual content)
Chromium Cr: ≤0.30 (residual content)
Nickel Ni: ≤0.30 (residual content)
Copper Cu: ≤0.25 (residual content)
Sample blank size (mm): 25
Heat treatment:
First quenching heating temperature (℃): 840; coolant: water, oil
Tempering heating temperature (℃): 540; coolant: water
Tensile strength (σb/MPa): ≥885
Yield point (σs/MPa): ≥735
Elongation after break (δ5/%): ≥12
Area shrinkage (ψ/%): ≥45
Impact absorption energy (Aku2/J): ≥55
Brinell hardness (HBS100/3000) (annealed or high temperature tempering state): ≤217 Sample size: The sample blank size is 25mm
40Mn2 delivery status: Delivered in heat treatment (normalizing, annealing or high temperature tempering) or non-heat treatment status, the delivery status should be specified in the contract.
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