42CrMo Forged Tubesheet for Custom Pressure Vessels

Product Highlights

• 42CrMo (equivalent to AISI 4140, 42CrMo4 1.7225) chromium‑molybdenum alloy steel forged tubesheet, manufactured by open‑die heavy forging process with compact internal grain flow, eliminating casting porosity and segregation defects
• Excellent tensile strength, yield strength and impact toughness after quenched‑and‑tempered heat treatment; high hardenability for thick‑section heavy‑duty pressure vessel applicationsAlibaba.co...
• Good high‑temperature strength and thermal stability, suitable for medium‑high temperature shell‑and‑tube heat exchangers, reactors and pressure equipment under cyclic pressure load
• Fine machinable property for dense tube hole array drilling, precise hole‑pitch control to meet TEMA & pressure‑vessel codes for tube‑to‑tubesheet welding / expansion joint quality
• Strict full‑range non‑destructive inspection including UT, MT, dimension verification for pressure‑bearing safety; fully custom‑made strictly per customer CAD drawings and process specifications
• Compliant with NB/T47008 pressure‑equipment forging standard, acceptable for third‑party witness inspection (SGS, TUV, BV)Chinese St...
• Long‑term reliable service for petrochemical, power generation, oil‑gas and heavy‑industrial shell‑and‑tube heat exchangers and pressure vessels

Product Overview

This custom 42CrMo forged tubesheet is heavy open‑die forged alloy steel component for pressure‑vessel shell‑and‑tube heat exchangers. Raw steel ingot goes through multi‑step upsetting & stretching forging to achieve dense metallographic structure, followed by quenching‑and‑tempering heat‑treatment to obtain balanced strength and toughness.

Compared with rolled plates, forged tubesheet delivers homogeneous through‑thickness mechanical performance and eliminates center segregation. After rough machining, NDT inspection and final precision CNC deep‑hole drilling, it supports high‑precision tube holes for expansion or welding assembly of heat‑exchange tubes. Widely adopted as core pressure‑bearing part for custom shell‑tube heat exchangers, condensers, reboilers and reactor internals under medium‑high pressure and medium‑high temperature working conditions.

Material Grade Characteristics – 42CrMo (42CrMo4 / 1.7225, AISI 4140)

• Cr‑Mo alloy quenched‑and‑tempering steel, obtains comprehensive mechanical performance via oil quenching plus high‑temperature tempering process
• High hardenability; thick cross‑section forgings still maintain stable strength and impact resistance
• Good resistance to fatigue under cyclic pressure and temperature fluctuation for pressure‑vessel working cycles
• Reliable high‑temperature mechanical property under continuous working temperature up to approx 500 °C
• Acceptable weldability with mandatory pre‑heating and post‑weld stress relief for field welding repair
• Specially designed for heavy‑section pressure‑bearing components requiring high strength, toughness and dimensional stability

Chemical Composition (Weight %)

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Mechanical Properties (Quenched & Tempered Condition, Forging per NB/T47008)

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Related Material Grades

• Alloy Steel Forgings: 35CrMo, 4130, 4340, 16Mn, 20MnMo, 12Cr2Mo1
• Carbon Steel Forgings: Q345R, 20#, A105, A516 Gr70
• Stainless Steel Forgings: 304, 316L, 321, 2205 Duplex
• Nickel‑Base Alloy: Inconel 625, Hastelloy C276
• Titanium Forgings: TA1, TA2

Key Advantages

1. Dense Forged Metallurgical Structure Multi‑direction open‑die forging eliminates internal shrinkage, porosity and segregation; uniform grain flow across full thickness, far superior to flame‑cut rolled plate for heavy thickness pressure‑vessel tubesheet.
2. Balanced Strength & Toughness for Pressure Cycle Quenched‑and‑tempered treatment delivers high tensile / yield strength together with good impact toughness, resisting deformation and crack initiation under cyclic pressure‑temperature load.
3. High Precision for Tube‑hole Machining Stabilized stress‑relieved condition minimizes machining distortion; supports dense array deep‑hole drilling with strict hole‑pitch, aperture and surface roughness requirements for tube expansion & welding quality.
4. Wide Custom‑Size Capacity Wide range for diameter and thickness, one‑piece forging for large‑size tubesheet; adaptable for fixed‑tube‑sheet, floating‑head and U‑tube heat‑exchanger designs.
5. Full Pressure‑vessel‑grade Quality Control Full set NDT, mechanical test and spectral analysis for each forging; meets international pressure‑equipment standards for global petro‑chemical and energy projects.

Typical Applications

• Petrochemical shell‑and‑tube heat exchangers, condensers and reboilers
• Power plant boiler auxiliary heat‑exchange equipment & high‑pressure heat exchangers
• Oil & gas processing pressure vessels, high‑pressure separator internals
• Chemical industry medium‑high pressure reactors and process heat‑transfer equipment
• Refinery fractionation unit heat‑exchanger core pressure‑bearing tubesheet
• Heavy‑industry custom pressure vessels requiring thick high‑strength alloy steel components

Processing Service

We provide integrated heavy forging, heat‑treatment and full precision machining services, produce finished tubesheet strictly according to customer CAD/PDF drawings:

• Ingot selection, multi‑step upsetting & stretching open‑die forging
• Quenching & tempering, stress relief heat‑treatment tailored for forging thickness
• Rough turning/milling, removing forging scale and surface defects
• CNC vertical lathe, gantry boring‑milling, CNC deep‑hole drilling for tube‑hole array, bolt holes, seal grooves and locating steps
• Anti‑rust passivation, protective coating for storage & sea transportation

We supply custom forged tubesheets for pressure‑vessel and heat‑exchanger manufacturers worldwide for petrochemical, power, oil‑gas and heavy‑chemical sectors.

Quality Assurance

• 100% UT Ultrasonic Testing for internal forging flaws complying with NB/T47008 requirement
• MT Magnetic Particle Inspection for surface crack detection
• Tensile test, impact test & hardness measurement for mechanical property verification
• Spectrometer full spectrum chemical composition analysis per forging lot
• High‑precision CMM dimensional inspection for diameter, thickness, hole pitch and tolerance

Mill Test Certificate EN 10204 3.1 can be provided with shipment documents before delivery. Third‑party inspection witness is available upon request.

Packing & Delivery

Packing

• Inner packaging: waterproof anti‑rust plastic film, protective cover for machined sealing faces and tube‑hole openings against scratch and rust
• Outer packaging: reinforced fumigated wooden case or heavy‑duty steel frame crate for long‑distance sea transportation
• Custom special packaging available on customer request for oversized heavy pieces

Lead Time Normally 25‑45 working days after receipt of advance payment. Exact delivery time depends on forging dimension, weight, heat‑treatment requirement, machining complexity and third‑party inspection schedule.