300m Round Bar
300m Round Bar
300m Round Bar

300m Round Bar

300m Round Bar
Steel-making Condition: EF, EF/EAF+LF+VD, EF/EAF+ESR
Delivery Condition:Annealed , Quenched + Tempered
Surface Condition:Black, Grinded, Peeled, Rough turned, Polished

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Product Introduction

Products Description

300M steel is a high-quality alloy structural steel with high strength, high toughness and excellent fatigue performance, which plays an important role in aerospace, machinery manufacturing and other fields.
300M Alloy Steel Performance Characteristics
(I) High strength
After proper heat treatment, the tensile strength can reach 1860-2000MPa, and the yield strength can reach 1480-1620MPa, which enables it to withstand extreme load conditions.
(II) High toughness
While maintaining high strength, it maintains good toughness and has a high fracture toughness value, which can effectively resist crack expansion and fracture, and improve the reliability and safety of the structure.
(III) Excellent fatigue performance
After long-term cyclic loading, 300M steel can still maintain good performance and has excellent fatigue resistance, which is suitable for parts subjected to alternating loads.
(IV) Good hardenability
Uniform performance can be obtained on a larger cross section to ensure the performance consistency of the entire part.

Chemical Composition %

Weight%	C	Mn	P & S	Si	Cr	Ni	Mo	V	Cu
300M	0.38 - 0.45	0.60-0.90	0.010	1.45-1.80	0.70-0.95	1.65-2	0.30-0.50	0.05-0.10	0.35

Production Description

300m material

Application fields
(I) Aerospace
Widely used in key parts such as aircraft landing gear, wing structures, engine components, etc., providing reliable material guarantee for the safe flight of aircraft.
(II) Mechanical manufacturing
Used in manufacturing heavy-duty transmission shafts, gears, high-strength bolts and other parts, and performs well under high-speed and heavy-load working conditions.
(III) Automobile industry
It is also used in chassis components, suspension systems and other parts of high-performance racing cars and high-end cars, improving the performance and safety of cars.

The following are some practical application cases of 300M steel:
1. Aircraft landing gear: In the manufacturing of landing gear for civil and military aircraft, 300M round steel is often used to make the main load-bearing parts of the landing gear, such as pillars, beams, etc. For example, the key structural parts of the landing gear of Boeing 737, Airbus A320 and other series of passenger aircraft and F-16, Su-27 and other fighters.
2. Aircraft engine parts: Some key shaft parts in the engine, such as turbine shafts, transmission shafts, etc., will be made of 300M round steel.
3. High-performance racing car parts: Some racing cars that pursue extreme performance, such as Formula One (F1) and Le Mans endurance racing cars, will use 300M bar in the chassis suspension system of connecting rods, half shafts and other parts to withstand the huge stress and fatigue load caused by high-speed driving and frequent speed changes and steering.
4. High-end mechanical transmission shafts: In the manufacture of transmission shafts for large-scale engineering machinery, high-end precision machine tools and other equipment, 300M alloy steel can rely on its high strength and excellent fatigue performance to ensure the reliability of the transmission shaft under high load and long-term operation conditions.
5. Oil drilling equipment components: For example, the drill pipe joints of oil drilling platforms, key load-bearing components in the lifting system, etc., the use of 300M round steel can adapt to harsh working environments and heavy load conditions.
6. Helicopter structural parts: 300M round steel is used in the rotor shafts of helicopters, shaft components of the transmission system, and key load-bearing structural parts of the fuselage. For example, some structural parts of helicopters such as AgustaWestland AW101 and Bell UH-1.
7. Satellite launch device components: In the key structures of satellite launch devices, such as support arms and connectors, high-strength and high-reliability materials are required. 300M material can meet the requirements and help ensure the stability and safety of satellite launches.
8. Offshore platform lifting system: used for tie rods, pins and other components in the lifting system of offshore oil production platforms. Due to the long-term exposure to marine corrosive environments and heavy loads, the high strength, fatigue resistance and certain corrosion resistance of 300M round bar make it an ideal material.
9. High-speed railway bogie components: With the development of high-speed railways, the performance requirements for bogie components are constantly increasing. Some key shafts, tie rods and other components in high-performance bogies will be manufactured using 300M bar to ensure the high-speed and safe operation of trains.
10. Large wind power equipment components: In the manufacture of main shafts, hub connecting shafts and other components of large wind turbines, 300M alloy steel can give full play to its advantages of high strength and fatigue resistance to adapt to complex wind loads and long-term operation requirements.