LMM GROUP is a manufacturing company engaged in one-stop solution for global industrial furnace heat-resistant alloy.
LMM is specialized in manufacturing 900-1250℃ heat-resistant alloy products.

If you are looking for furnace rolls, contact us today to learn more.

Cracking furnace tube (ethylene, styrene)


Tubularcracking furnace is the main way to produce ethylene in China. Ethylene cracking furnace mainly includes: heating system, heat recovery system, reaction system.
The furnace includes: burner, radiant section, convection section and quench system, and high pressure steam system. The cracking furnace tube is used in the radiation section, also known as the radiant section furnace tube.

Although operating at relatively low pressure, the radiant coils in an ethylene furnace operate under extremely severe conditions of temperature and stress. In order to achieve the required process temperature inside the outside temperature can be between 950 and 1100oC depending on the degree of coking produced on the inner surface. In addition the tube temperature must be reduced for de-coking, sometimes in a period of every 30 days, creating additional stress from the inflexible coke layer which may involve stretching and bulging. Carburisation of the tubes causes progressive embrittlement over time eventually reducing the life of the tubes.

LMM have alloys to minimise these effects on the process operation. Depending on the furnace design, we can produce a range of tube diameters we also produce cast return bends, wye, tee and tetra fittings and induction bend and offset tubes. We can also produce transfer line castings and connection pieces.

Technical specification

The main parts of the radiant section of ethylene cracking furnace include centrifugal casting tube, centrifugal casting bent tube, static casting tube, forgings and rolled pipe etc.

        Manufacturing standards:

        1. The design requirements of the customer and engineering company.

        2.Centrifugal casting: HG/T 2601, A608 DIN, ASTM 10295, G5122 JIS…

        3.Static casting: HG/T 3673, A351 ASTM…

        4.Forging: according to the engineering requirement

        5.Rolled pipe: according to the engineering requirement

        Materials: heat resistant alloys of various grades, such as:

        ZG40Cr25Ni35Nb,ZG40Cr35Ni45Nb,HP-Nb,GX40NiCrSiNb35-26, HT50,GX40NiCrNb45-35, SCH24XNb, etc.

Manufacturing capacity

We can produce furnace tubes for a 1-million-ton ethylene cracking furnace per month.

Manufacturing process: centrifugal casting, sand casting, precision casting.
Furnace tube: O.D.:50mm-200mm, wall thickness: 5mm-20mm;
Manifold: O.D.:100mm-400mm, wall thickness:10mm-40mm;
Centrifugal casting bent tube: to drawings.
Static casting: 90°elbow, 180°elbow, Tee, hand type tube, special-shaped three-dimensional elbow, hanger etc..

10 medium frequency induction furnace,

1 electric arc furnace;

8 special centrifuge machine;

2 surface cleaning machine;

9 special boring machine,

2 CNC pipe welding bevel equipment;

2 special static casting mechanical processing equipment;

6 special welding production lines.

Gold Service Contracts

We developed the Gold Service Program to improve customer service, communication, processing time, and order turn around.

Local Technical Sales

Our technical sales team coupled with our customer service organization equip us to be ready to handle your challenges.

Program Management

Our corporate procurement, engineering and sales professional team have demonstrated success in taking over large, complex outsourcing initiatives.

Quality Assurance

Quality assurance is one of the various services that we offer. Our quality department and process is ISO 9001 compliant and in some plants certified.

LMM GROUP is a manufacturing company engaged in one-stop solution for global industrial furnace heat-resistant alloy.LMM is specialized in manufacturing 900-1250℃ heat-resistant alloy products.

We own workshop area more than 180,000 m2 and 620 employees.The plant has production equipment 698 sets and National level laboratory,with an annual production capacity of 24,000 tons.

All the managements and technicians have more than 15 years’ experience in centrifugal and static casting production of heat-resistant alloy. LMM accumulated rich experience and formed its own unique patented technology and know-how with 191 patents which are all applied to our products and manufacturing.

Are You Looking for Furnace Rolls?

No matter what the use, LMMGROUP offers high-quality furnace rolls at competitive prices for your next project. If you are looking for furnace rolls, contact us today to learn more.

Q:Are you a trading company or manufacturer?

A:LMMGROUP is an industry and trade integration company.

Q:I have some special requirement about specifications,can you do it?

A:Yes.We have a well-rounded product range, which endows us with the capability of applying many special specifications. Please feel free to contact us with yours.

Q:Do you accept OEM service?

A:Yes, we do.

Q:What is your delivery time?

A:It depends on the size/complexity of your order and our own production schedule. Usually we provide a faster delivery than the industry’s average.

Q:What is the payment term?

A:Our payment terms are negotiable.

Q:Can I have my own logo on the product?

A:Sure, we can apply your own logo on the products according to your drawings

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Special product design, please send specific data and drawings to our mailbox or form