UMCO 50 Forgings UMCo-50 · UMCo 50 · UM Co-50 · UMCO50 · cobalt-base heat-resistant alloy
Open-die forged rings, seamless rolled rings, bars, discs, flanges, sleeves, shafts and tube sheets in UMCO 50, forged to your drawing in Jiangyin, China.
UMCO 50 (also written UMCo-50, UMCo 50 or UM Co-50) is a cobalt-base heat-resistant alloy containing about 50% cobalt, 28% chromium and 21% iron. It is used where parts have to resist thermal shock and wear at high temperature. Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu, China that forges UMCO 50 into rings, bars, discs, flanges, sleeves and shafts to customer drawing, ESR melted, certified to EN 10204 3.1 or 3.2.
- Alloy family
- Cobalt-base heat-resistant
- Nominal chemistry
- 50 Co · 28 Cr · 21 Fe · 0.12 C max
- Melting route
- EAF + VOD → ESR
- Process
- Open-die forging · ring rolling
- Ring OD range
- 200 – 3,000 mm
- Bar diameter
- Ø 80 – 1,200 mm
- Piece weight
- 20 kg – 20,000 kg
- Ultrasonic testing
- EN 10228-3 · SEP 1921 · ASTM A388
- Certificate
- EN 10204 3.1 / 3.2
- Minimum order
- 1 piece, made to drawing
- Lead time
- 25 – 45 days
- Country of origin
- China (Jiangyin, Jiangsu)
- Quotation
- Within 24 hours
Material
What is UMCO 50 alloy?
UMCO 50 is a cobalt-base heat-resistant alloy. About half of it is cobalt, with 28% chromium and 21% iron, and carbon held to 0.12% maximum. The chromium forms a stable oxide scale on the surface. The cobalt matrix holds its strength as the temperature rises. Buyers specify the grade for its thermal shock resistance and its wear resistance at high temperature.
UMCO 50 is normally chosen when a component sits in a furnace or a hot gas stream and is heated and cooled repeatedly. It has worked in heat treatment and furnace applications where other alloys could not be used because their melting point was too low.
The grade is written several ways on enquiries and drawings: UMCO 50, UMCo-50, UMCo 50, UM Co-50 and UMCO50. All of them refer to the same material. Some suppliers also cross-reference it to material number 2.4778. Confirm the exact specification on your drawing when you order.
Chemistry
UMCO 50 chemical composition
| Element | Symbol | Nominal wt % | Role in the alloy |
|---|---|---|---|
| Cobalt | Co | 50 | Base matrix; retains strength at high temperature |
| Chromium | Cr | 28 | Forms the protective oxide scale; oxidation resistance |
| Iron | Fe | 21 | Balance of the matrix |
| Carbon | C | 0.12 max | Carbide formation; kept low for toughness |
Values are nominal. The chemistry of the actual heat supplied is analysed and printed on the EN 10204 certificate delivered with the forgings. If your specification calls for a tighter range on any element, state it with the enquiry.
Mechanical
UMCO 50 mechanical properties at room temperature
| Property range | Tensile strength Rm | Yield strength Rp0.2 | Elongation A |
|---|---|---|---|
| Range 1 | 90–118 kgf/mm² 883–1,157 MPa 128–168 ksi |
37–46 kgf/mm² 363–451 MPa 53–65 ksi |
10–28 % |
| Range 2 | 80–90 kgf/mm² 785–883 MPa 114–128 ksi |
30–37 kgf/mm² 294–363 MPa 43–53 ksi |
10–20 % |
Two property ranges are normally quoted for UMCO 50 forgings. Which one a part falls into depends on section size and heat-treatment condition. Metric and imperial figures are converted from the kgf/mm² values (1 kgf/mm² = 9.80665 MPa). Actual results for your heat are recorded on the certificate. Elevated-temperature and stress-rupture data can be provided on request. Send the design temperature and duty cycle with the enquiry.
Forms
UMCO 50 forged products we manufacture
Every UMCO 50 part is forged to the customer's drawing. There is no fixed catalogue and the minimum order is one piece. The table below shows the shapes we forge most often and the size range for each.
| Forged form | Typical size range | Common use |
|---|---|---|
| Forged rings & seamless rolled rings | OD 200–3,000 mm · wall 20–500 mm · height ≤ 1,000 mm | Turbine casings, furnace rings, bearing races |
| Forged round bars | Ø 80–1,200 mm · length ≤ 6,000 mm | Machining stock, valve stems, pins |
| Forged discs & blanks | Ø 100–2,500 mm · thickness 30–800 mm | Turbine discs, blind flanges, wear plates |
| Forged flanges | DN 50–2,000 · to drawing or ASME B16.5 / B16.47 | Pressure vessels, hot gas piping |
| Forged sleeves & bushings | OD 100–1,500 mm · ID from 60 mm | Furnace rollers, compressor bushings |
| Forged hollow bars & tubes | OD 150–1,500 mm · length ≤ 4,000 mm | Radiant tubes, cylinder bodies |
| Forged shafts & spindles | Ø 100–1,000 mm · length ≤ 8,000 mm | Turbine shafts, furnace roll shafts |
| Forged tube sheets | Ø ≤ 2,500 mm | Shell & tube heat exchangers |
| Forged blocks & step shafts | To drawing | Dies, valve bodies, nozzles |
Single-piece weight 20 kg to 20,000 kg. Delivery condition: as-forged, rough machined, or finish machined to print. Larger or unusual sections are quoted on enquiry.
Applications
Where UMCO 50 forgings are used
| Industry / equipment | UMCO 50 forged components |
|---|---|
| Gas turbines & industrial thermal processing | Seamless rolled rings, shafts, casing rings |
| Furnaces & heat-treatment equipment | Furnace wheels, manifolds, rolls, boiler tube supports, hearth fixtures |
| Pressure vessels & heat exchangers | Shafts, pipes, tubes, tube sheets and flanges for pressure vessels, air receivers and shell & tube heat exchangers |
| Process plant | Shafts, flanges, forged rings and pipes for columns, towers, tanks, silos, process modules and preheaters |
| Oil & gas, onshore and offshore | Bushings, sleeves, disks and forged discs for subsea and deepwater production systems, industrial air compressors, power generators and nitrogen generators |
| Wellhead equipment | Nozzles, eccentric shafts, bodies for wellhead and Christmas tree assemblies |
| Valves | Valve stems, seat rings, valve blocks and bodies for ball, check, globe, gate and plug valves and strainers |
| Power transmission | Rings, forging spindles, bars and gear blanks for turbines, gas compressors and gearboxes |
| Nuclear | Open-die forged pieces, nozzles, crankshafts |
| Die casting & automotive | Die casting inserts and cores, automotive exhaust valve blanks |
Process
How we make and test UMCO 50 forgings
Melting
UMCO 50 is melted by electric arc furnace with vacuum oxygen decarburisation (EAF + VOD) and then electroslag remelted (ESR). ESR refines the solidification structure, reduces segregation and lowers non-metallic inclusion content. This is what allows heavy sections to pass a strict ultrasonic acceptance class.
Non-destructive testing
- Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, to the acceptance class you nominate.
- Liquid penetrant testing to ASTM E165 or EN ISO 3452 for surface examination. Magnetic particle inspection is not used on UMCO 50, because a cobalt-base alloy is not ferromagnetic.
- Dimensional inspection against the approved forging drawing.
Certification
- EN 10204 3.1 mill certificate as standard: heat number, chemical analysis, mechanical test results, heat treatment record and NDT results.
- EN 10204 3.2 certificate countersigned by a third-party body such as SGS, BV, TÜV, Lloyd's Register or DNV, on request.
- Witnessed testing and customer source inspection can be arranged at the works.
Ordering
How to order UMCO 50 forgings
- Send the drawing or dimensions. Email a 2D drawing, 3D model or the finished dimensions, with quantity, applicable standard and delivery condition, to sales@steelforgepieces.com.
- Receive the quotation. The quotation covers forging weight, machining allowance, testing scope and lead time. It is normally returned within 24 working hours.
- Approve the forging drawing. We issue the forging drawing with allowances plus the inspection and test plan for your written approval before cutting metal.
- Production and testing. ESR remelt, forge or ring roll, heat treat, then chemical analysis, tensile test and ultrasonic testing to the agreed standard.
- Certification and shipment. EN 10204 3.1 or 3.2 certificate issued with the goods; export packing for sea or air freight from Shanghai.
Questions
Frequently asked questions about UMCO 50
What is UMCO 50 alloy?
UMCO 50 is a cobalt-base heat-resistant alloy containing roughly 50% cobalt, 28% chromium and 21% iron, with carbon held to 0.12% maximum. It is used for thermal-shock and wear resistance at high temperature, particularly in heat-treatment furnaces, gas turbines and other thermal processing equipment where alloys with lower melting points cannot be used.
What is the chemical composition of UMCO 50?
Nominally 50% cobalt, 28% chromium, 21% iron and carbon 0.12% maximum. Every heat is analysed and the actual chemistry is printed on the EN 10204 certificate delivered with the forgings.
Are UMCO 50, UMCo-50, UMCo 50 and UM Co-50 the same material?
Yes. UMCO 50, UMCo-50, UMCo 50, UM Co-50 and UMCO50 are different written forms of the same cobalt-base heat-resistant alloy. Enquiries and purchase orders using any of these spellings are treated the same way.
What forged forms of UMCO 50 can be supplied?
Open-die forged rings, seamless rolled rings, round bars, discs and blanks, flanges, sleeves and bushings, hollow bars and forged tubes, tube sheets, shafts, spindles and rectangular blocks. Everything is forged to customer drawing. There is no fixed catalogue.
What is the maximum service temperature of UMCO 50?
UMCO 50 is specified for high-temperature service where thermal shock and repeated heating and cooling occur, such as furnace fixtures and gas-turbine hot-section hardware. The safe limit for any given part depends on stress, furnace atmosphere and thermal cycle, so the design temperature should be confirmed against test data for the intended duty. Send your operating conditions with the enquiry and we will supply the applicable data.
How is UMCO 50 melted before forging?
By electric arc furnace with vacuum oxygen decarburisation (EAF + VOD), followed by electroslag remelting (ESR). ESR refines the ingot structure, reduces segregation and lowers inclusion content. This matters for the ultrasonic acceptance of heavy sections.
What non-destructive testing is performed on UMCO 50 forgings?
Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, to the acceptance class you nominate. Liquid penetrant testing to ASTM E165 or EN ISO 3452 for surface examination. Magnetic particle inspection is not applicable, because a cobalt-base alloy is not ferromagnetic. Hardness, tensile testing and chemical analysis are carried out on every heat.
What certificates are supplied with UMCO 50 forgings?
An EN 10204 3.1 mill certificate as standard, showing heat number, chemical analysis, mechanical test results, heat treatment record and NDT results. An EN 10204 3.2 certificate countersigned by a third party such as SGS, BV, TÜV, Lloyd's Register or DNV is available on request.
What is the minimum order quantity and lead time for UMCO 50 forgings?
Minimum order is one piece, because every UMCO 50 forging is made to drawing. Typical lead time is 25 to 45 days from approval of the forging drawing, depending on section size, heat treatment and testing scope. Confirm the current lead time when you request a quotation.
Which alloys are similar to UMCO 50?
The closest relative is UMCO 51. Other cobalt-base and high-temperature alloys used for comparable duty include Haynes 25 (L-605), Haynes 188, Multimet N155, Rene 41, Waspaloy, Haynes 230 and Inconel 617. We forge all of these grades.
Who supplies UMCO 50 forgings?
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, manufacturing UMCO 50 forgings to customer drawing. Contact sales@steelforgepieces.com or +86 189 2135 9659.
How do I get a price for a UMCO 50 forging?
Email the drawing or finished dimensions, quantity, required standard and delivery condition to sales@steelforgepieces.com. A quotation covering forging weight, machining allowance, testing scope and lead time is normally returned within 24 working hours.
Manufacturer
Jiangyin Jiangnan Metal Co., Ltd.
An open-die forging factory in Jiangyin, Jiangsu, China. We forge rings, seamless rolled rings, bars, discs, flanges, sleeves, shafts and tube sheets in carbon steel, alloy steel, tool steel, stainless steel, and nickel and cobalt alloys including UMCO 50. All parts are made to drawing, from one piece, and shipped worldwide.
- Address
- No.1 Chengxiqiao Road,
Zhouzhuang Town, Jiangyin City,
Jiangsu Province, China - Telephone / WhatsApp / WeChat
- +86 189 2135 9659
- Website
- www.steelforgepieces.com
Published by Jiangyin Jiangnan Metal Co., Ltd. · Open-die forging factory, Jiangyin, Jiangsu, China
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quoted with attribution to Jiangyin Jiangnan Metal Co., Ltd. (www.steelforgepieces.com).