Austenitic stainless steel Tubesheet 304L/316L/904L
‑ Forged austenitic stainless steel tubesheet covering grades 304L, 316L and super‑austenitic 904L, manufactured by open‑die forging process; compact full‑thickness grain flow eliminates slab segregation, porosity and internal defects compared with rolled plate cutting
‑ Low‑carbon design of 304L & 316L effectively prevents intergranular corrosion after welding; 904L super‑austenitic grade with high nickel‑molybdenum‑copper content delivers outstanding resistance to acid, chloride and pitting corrosion for harsh corrosive working media
‑ Excellent ductility and machinability for high‑density CNC multi‑spindle deep‑hole drilling; strict control for hole pitch, aperture tolerance and perpendicularity to guarantee reliable tube expansion and tube‑to‑tubesheet welding quality
‑ Good weldability for field repair welding; solution‑annealed plus stress‑relieved delivery minimizes residual stress and machining deformation for heavy‑thickness components
‑ Fully custom‑manufactured strictly according to customer CAD drawings; compatible with fixed‑tubesheet, floating‑head and U‑tube heat‑exchanger configurations
‑ Compliant with ASME TEMA and pressure‑vessel forging specifications; third‑party witness inspection (SGS, TUV, BV) is acceptable
‑ Long‑term stable service for pharmaceutical, food, fine‑chemical, petrochemical, flue‑gas desulfurization and high‑corrosion heat‑exchange equipment
This forged austenitic stainless steel tubesheet is critical pressure‑bearing component for shell‑and‑tube heat exchangers. Produced from premium stainless steel ingot through multi‑direction upsetting‑stretching open‑die forging, followed by solution annealing and stress‑relief heat‑treatment to achieve homogeneous metallurgical microstructure through the entire thickness.
304L serves for general weak‑corrosion environment; 316L improves pitting‑corrosion resistance for moderate chloride‑containing medium; super‑austenitic 904L is applied for severe corrosion scenarios such as dilute sulfuric acid, mixed acid and high‑chloride process. After rough machining, full non‑destructive testing and precision CNC deep‑hole drilling for tube‑hole array, the tubesheet is ready for tube bundle assembly via expansion or strength welding. Widely adopted for condensers, evaporators and process heat‑exchanger equipment under corrosive operating conditions.
‑ 304L (F304L, UNS S30403, EN 1.4307):Low‑carbon version of 304 austenitic stainless steel; avoids intergranular precipitation of chromium carbide during welding; good corrosion resistance for fresh water, atmospheric and weak‑acid medium, widely used in food and sanitary‑grade equipment.
‑ 316L (F316L, UNS S31603, EN 1.4404):Molybdenum‑alloyed low‑carbon austenitic stainless steel; greatly improved pitting and crevice corrosion resistance compared with 304L, suitable for moderate‑chloride‑containing chemical and pharmaceutical process.
‑ 904L (F904L, UNS N08904, EN 1.4539 Super‑austenitic):High‑Ni‑Mo‑Cu super‑austenitic stainless steel; excellent resistance to dilute non‑oxidizing acid, chloride‑induced pitting and crevice corrosion, ideal for harsh corrosive conditions where ordinary 316L cannot meet service requirements.
表格
| Grade | EN Standard No. | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni | Mo | Cu | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 304L | 1.4307 | 0.03 | 1.00 | 2.00 | 0.045 | 0.030 | 18.0‑20.0 | 8.0‑12.0 | — | — | Balance |
| 316L | 1.4404 | 0.03 | 1.00 | 2.00 | 0.045 | 0.030 | 16.0‑18.5 | 10.0‑14.0 | 2.0‑3.0 | — | Balance |
| 904L | 1.4539 | 0.02 | 1.00 | 2.00 | 0.045 | 0.035 | 19.5‑21.5 | 23.0‑28.0 | 4.0‑5.0 | 1.0‑2.0 | Balance |
表格
| Property | Forged 304L Tubesheet | Forged 316L Tubesheet | Forged 904L Tubesheet |
|---|---|---|---|
| Delivery Condition | Solution Annealed, Stress‑Relieved, NDT Inspected | Solution Annealed, Stress‑Relieved, NDT Inspected | Solution Annealed, Stress‑Relieved, NDT Inspected |
| Minimum Tensile Strength | ≥485 MPa | ≥485 MPa | ≥490 MPa |
| Minimum 0.2% Yield Strength | ≥170 MPa | ≥170 MPa | ≥215 MPa |
| Minimum Elongation (50mm gauge) | ≥40 % | ≥40 % | ≥35 % |
| Maximum Brinell Hardness | ≤201 HB | ≤201 HB | ≤220 HB |
Note: Actual mechanical values vary with forging thickness; complete batch test report will be provided for each individual forging piece.
‑ Austenitic Stainless Forgings: F304, F321, F347
‑ Duplex & Super‑Duplex Forgings: 2205, 2507
‑ Nickel‑Base Alloy Forgings: Inconel 625, Hastelloy C276
‑ Titanium Forgings: TA1, TA2
‑ Carbon & Alloy Steel Forgings: A105, 16Mn, 42CrMo, F22
- High‑Integrity Forged Metallurgical Structure Multi‑step open‑die forging eliminates center segregation and internal porosity; uniform grain flow through full thickness, superior to rolled‑plate cutting for heavy‑thickness tubesheet.
- Gradient Corrosion‑Resistance Grade Selection 304L for general corrosion; 316L for moderate chloride medium; super‑austenitic 904L for severe acid‑chloride composite corrosion; flexible grade selection balances performance and project investment.
- Low‑Carbon Grade Prevents Weld Intergranular Corrosion Low‑carbon formulation of 304L/316L reduces chromium carbide precipitation during welding; 904L ultra‑low carbon further improves anti‑corrosion reliability for post‑weld service.
- High Machining Stability Solution‑annealed plus stress‑relieved condition minimizes distortion during heavy‑duty multi‑hole deep‑hole drilling; guarantees strict tolerance for hole pitch, aperture and sealing‑groove dimension.
- Pressure‑Vessel‑Grade Full Traceability Quality Control 100% multi‑mode NDT inspection and batch‑by‑batch PMI spectral analysis; fully traceable material records complying with international pressure‑equipment standards for global chemical and pharmaceutical projects.
‑ Food & pharmaceutical sanitary shell‑and‑tube heat exchangers, condensers and evaporators
‑ Fine‑chemical industry process heat‑transfer equipment under weak‑acid and moderate‑chloride medium
‑ Flue‑gas desulfurization, waste‑liquid recovery and corrosive waste‑heat recovery heat exchangers
‑ Petro‑chemical units with high‑chloride and dilute‑acid corrosive working‑conditions
‑ Seawater and brine‑treatment heat‑exchange pressure‑bearing components
‑ Special corrosive‑medium heat‑exchanger projects requiring super‑austenitic 904L material
We provide integrated heavy stainless‑steel forging, heat‑treatment and full precision machining services, produce finished tubesheet strictly according to customer CAD/PDF drawings:
‑ Premium ingot selection for 304L / 316L / 904L, multi‑upsetting open‑die forging
‑ Solution annealing and stress‑relief heat‑treatment customized for forging thickness
‑ Rough turning/milling for removing forging scale and surface defects
‑ CNC vertical lathe, gantry boring‑milling, multi‑spindle deep‑hole drilling for tube‑hole array, bolt holes, sealing grooves and locating steps
‑ Pickling & passivation, protective covering for machined sealing surfaces and hole openings
We supply custom forged austenitic stainless steel tubesheets for heat‑exchanger and pressure‑vessel manufacturers worldwide across pharmaceutical, fine‑chemical, petro‑chemical and environmental‑protection sectors.
‑ 100% UT Ultrasonic Testing for internal forging flaws complying with ASTM A182 and NB/T47010 requirements
‑ MT Magnetic‑Particle & PT Penetrant Inspection for surface and inner‑hole crack detection
‑ Tensile test, impact test & hardness measurement for mechanical‑property verification
‑ Spectrometer PMI full‑spectrum chemical‑composition analysis for each forging lot
‑ High‑precision CMM dimensional inspection for diameter, thickness, hole pitch and all critical tolerances
Mill Test Certificate EN 10204 3.1 can be provided together with shipment documents before delivery. Third‑party inspection witness is available upon request.
Packing
‑ Inner packaging: waterproof anti‑rust plastic film; dedicated protective covers for machined sealing faces and tube‑hole openings against scratch, dust and corrosion
‑ Outer packaging: reinforced fumigated heavy‑duty wooden case or high‑strength steel‑frame crate for long‑distance sea transportation
‑ Custom special packaging available on customer request for oversized and heavy‑weight forgings
Lead Time Normally 25‑45 working days after receipt of advance payment. Exact delivery time depends on forging dimension, material grade, drilling complexity and third‑party inspection schedule.
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