Leading Source for Centrifugal Castings from China — HP40/HK40 Reformer Tubes, Cracking Furnace Tubes & Custom Alloy Castings
Kbear Metal is a trusted China centrifugal casting manufacturer producing HP40, HK40, HP-Nb, Inconel, and stainless steel centrifugal cast tubes since 1989. We serve petrochemical reformers, ethylene cracking furnaces, steel mill rolls, and custom alloy casting buyers across 40+ markets — from 100 mm to 1,800 mm OD, up to 8,000 kg per piece, with ASTM A608, ASTM A351, and ISO 9001 documentation.
// Casting Capability
How centrifugal casting builds defect-free metal tubes and rings
The controlled-process method we use to produce castings with denser grain structure and fewer porosity defects than sand-cast equivalents.
Centrifugal casting is the controlled-process method we use at Kbear Metal to produce defect-free metal tubes and rings. Molten alloy is poured into a rapidly spinning mold (200–1,500 RPM depending on geometry); centrifugal force pushes denser metal outward to the mold wall while lighter impurities, gas, and oxides collect on the inner diameter where they are machined away after cooling.
The result is a casting with denser grain structure, fewer porosity defects, and significantly better mechanical properties than sand-cast equivalents — particularly for high-temperature alloys like HP40 and HK40 used in petrochemical reformer tubes and ethylene cracking furnaces.
Kbear Metal operates two centrifugal casting lines, both feeding into the same machining, heat treatment, NDT inspection, and finishing workflow:
Horizontal Centrifugal Casting
For cylindrical parts — tubes, pipes, sleeves, bushings — up to 1,800 mm OD and 6,000 mm length.
Vertical Centrifugal Casting
For ring-shaped and asymmetric parts — flanges, end covers, special-shaped components — up to 1,500 mm OD.
Eight core product families produced under one roof
Each family links to a dedicated technical page with material grades, dimensional ranges, and application data.
Reformer Tubes
HP40/HP-Nb tubes for hydrogen reformers, methanol synthesis, ammonia plants. ASTM A608.
Ethylene Cracking Furnace Tubes
HK40/HP-Nb cracking coils for ethylene, propylene, and pyrolysis furnaces.
Centrifugal Cast Tubes & Pipes
Stainless and alloy cast tubes from 100-1,800 mm OD for high-temperature service.
Centrifugal Cast Rings & Sleeves
Ring castings for bearings, slide rings, kiln components, pump housings.
Centrifugal Cast Bushings
Bronze, nickel-alloy bushings for marine, mining, heavy machinery service.
Steel Mill Sprockets & Rolls
Wear-resistant centrifugal castings for steel mill furnace rolls and sprockets.
Tapered & Special-Shaped Tubes
Custom-shaped castings — tapered, flanged, asymmetric profiles cast as one piece.
Hollow Bars
Centrifugally cast hollow bars for machining into rings, sleeves, gears.
Every major heat, corrosion, and wear-resistant alloy family
Material verified by spectrometer on every melt. Mill certificates per EN 10204 3.1 ship with every batch.
| Alloy Family | Common Grades | Service Temp | Best For | Page |
|---|---|---|---|---|
| HP Series | HP40, HP-Nb, HP-Mod, HP-MA | Up to 1,150°C | Reformer tubes, ammonia plants | View HP40 → |
| HK Series | HK40, HK45 | Up to 1,100°C | Ethylene cracking, pyrolysis | View HK40 → |
| Stainless Steel | 304H, 310, 316L, 321H | Up to 900°C | Process piping, chemical service | View Stainless → |
| Nickel Alloys | Inconel 600/625/800H, Incoloy | Up to 1,200°C | Extreme heat & corrosion | View Nickel → |
| Heat-Resistant | 1.4848, 1.4865, 35Cr-45Ni | Up to 1,150°C | Furnace tubes, heating elements | View Heat-Resistant → |
| Wear-Resistant | High-Cr cast iron, Ni-Hard | Wear duty | Mill rolls, sprockets, grinding | View Wear-Resistant → |
| Duplex Stainless | 2205, 2507, Super Duplex | Corrosive + load | Marine, chemical pumps | Get Offer |
| Copper / Bronze | C95400, C90300, Aluminum Bronze | Bearing service | Bushings, sliding bearings | Get Offer |
Production envelope across horizontal and vertical lines
Dimensions outside this matrix can be quoted on a project basis with custom tooling.
| Parameter | Horizontal Line | Vertical Line |
|---|---|---|
| Max Outer Diameter (OD) | 1,800 mm | 1,500 mm |
| Min Outer Diameter (OD) | 100 mm | 200 mm |
| Max Length | 6,000 mm | 800 mm |
| Wall Thickness Range | 10 – 150 mm | 15 – 200 mm |
| Max Casting Weight | 8,000 kg | 3,500 kg |
| Mold RPM Range | 200 – 1,500 | 100 – 800 |
| Mold Material | Sand / Metal | Metal (Cu-alloy) |
| Best For | Tubes, pipes, sleeves | Rings, asymmetric, flanged parts |
Where centrifugal casting is the standard manufacturing route
Wherever a metal part must resist extreme heat, pressure, abrasion, or corrosion — six industry segments make up the bulk of our shipments.
Petrochemical & Refining
HP40 and HP-Nb reformer tubes for hydrogen production units, methanol synthesis, ammonia plants. Working temperatures 850-1,050°C. ASTM A608 standard. Single-piece casting eliminates weld-zone failure points common in fabricated tubes.
View Petrochemical →Ethylene & Petrochemical Cracking
HK40 and HP-Nb cracking furnace tubes and return bends for ethylene, propylene, and pyrolysis furnaces. Working temperature 1,000-1,150°C. Creep-resistant microstructure outperforms forged tubes in fatigue cycles.
View Cracking Tubes →Steel Mill & Metallurgy
Wear-resistant centrifugal castings for steel mill furnace rolls, walking-beam furnace components, sprockets, slide bearings. High-chromium and nickel-alloy grades selected by application — abrasion, thermal cycling, or both.
View Steel Mill →Cement & Mining
Kiln roller shells, mill liners, abrasion-resistant sleeves for cement kilns and mining grinding equipment. High-chromium cast iron with hardness 58-65 HRC for severe abrasion service.
View Wear-Resistant →Power Generation
Heat-resistant boiler tubes, superheater coil supports, gas turbine inlet guide vanes. Inconel and Incoloy grades for high-temperature service in coal, gas, and combined-cycle power plants.
View Nickel Alloy →Glass Manufacturing
Glass plant furnace rolls, forehearth components, and centrifugally cast sleeves for glass-handling equipment. Material selection focused on thermal shock resistance and dimensional stability at temperature.
View Heat-Resistant →Eight controlled stages from drawing to packed export crate
Engineering checkpoints between every stage. Nothing moves forward until the prior stage is signed off.
Drawing Review & DFM
Engineers review DWG/STEP and return DFM feedback inside 48 hours. Material grade, mold type, and casting orientation confirmed.
Mold Design & Prep
Sand mold or metal mold selected based on part geometry, alloy, and quantity. Coating, preheating, dimensional check.
Melting & Alloy Verify
Electric arc or induction furnace melts raw materials. Spectrometer analyzes chemistry mid-melt; adjustments before pouring.
Pouring & Casting
Mold spinning at calculated RPM (200-1,500). Molten metal poured at controlled rate. Spinning continues through solidification.
Cooling & De-molding
Controlled cooling cycle to prevent thermal cracking. Casting extracted; ID surface rough-machined to remove impurity layer.
Heat Treatment
Solution annealing, normalizing, or stress-relief per alloy specification. Controlled atmosphere; documented thermal profile.
NDT & QC
X-ray or ultrasonic testing for internal defects. Dye penetrant for surface cracks. Hydrostatic pressure test for tubes.
Machining & Ship
Final OD/ID machining to drawing tolerance. Heat number stamped on each casting. Full documentation bundled.
See how a centrifugal casting gets made
Three short videos showing real production, quality verification, and packing at our Pingdu factory.
Melting & Centrifugal Casting in Action
Induction furnace melt at 1,550°C, spectrometer chemistry check, then pour into spinning mold rotating at 800 RPM.
NDT Inspection & Pressure Testing
Ultrasonic and dye-penetrant testing on every batch. Hydrostatic pressure test at 1.5x design pressure per ASME B31.3.
CNC Machining to Container Loading
Final OD/ID machining to drawing tolerance, heat number stamping, then export crating for 40+ countries.
Standards procurement teams expect to see
Centrifugal castings sold into petrochemical, refining, and power-generation markets must pass third-party compliance audits. Kbear Metal manufactures to international standards.
Heat-Resistant Castings
Iron-Chromium-Nickel Heat-Resistant Castings — HP40/HK40 reformer tubes.
Austenitic Steel Castings
For High-Temperature Service — stainless cast pipes.
Corrosion-Resistant
Iron-Chromium-Nickel — chemical service castings.
Heat-Resistant Steel
EU export standard for refinery applications.
Quality Management
Quality Management System — audited annually.
Material Test Cert
3.1 mill certificates shipped per batch.
Pressure Equipment
EU directive for pressure vessel components.
Third-Party Witnessed
SGS, BV, TÜV witnessed inspection available.
Why international buyers source centrifugal castings from Kbear
Petrochemical procurement engineers, steel mill maintenance managers, and EPC project buyers share three concerns when sourcing castings from China — Kbear Metal addresses all three by design.
In-House Spectrometer & NDT Lab
Every melt analyzed for chemistry before pouring. X-ray, ultrasonic, dye penetrant, and hydrostatic pressure testing on every batch. No outsourced testing means no surprises during your incoming inspection.
Full Documentation Chain
Mill certificates (EN 10204 3.1), NDT reports, dimensional inspection reports, and heat-treatment certificates bundled with every shipment. Heat number traceability from raw material to packed crate.
35+ Years Export Experience
Active shipments to US, UK, Germany, France, Russia, South Korea, Japan, Pakistan, Canada, Kazakhstan, Taiwan. Multi-language documentation available. EU PED compliance for pressure vessel components.
Single-Piece Casting Capability
Complex-shape tubes — tapered, flanged, asymmetric — cast as a single piece. Eliminates weld-zone failure modes common in fabricated alternatives. Critical for high-pressure, high-temperature service.
Buyer questions, answered directly
Common questions from procurement engineers, EPC project buyers, and maintenance managers sourcing centrifugal castings from China.