FAQ About 30CRMO Steel

What is 30CRMO Steel?

30CrMo steel is an alloy steel used for engineering and mechanical structures, with high strength and toughness, and good high temperature strength at temperatures below 500 ° C. 30CrMo material also has good machinability, medium cold bending plasticity and plasticity, high hardenability, good weldability, and is usually used in the regulated state.

What is the executive standard of 30CRMO steel?

Chromium-molybdenum alloy steel is one of the alloy steels in China. 30 refers to the carbon content. It is used to manufacture 10.9S and 8.8S high-strength bolts. However, it must be tested before use to confirm its content before use. The Chinese brand 30CrMO is equivalent to the Japanese SCM430.

What are the mechanical properties of 30CRMO steel?

Sample blank size (mm): 25

Heat treatment:

Heating temperature of the first quenching (℃): 880; Coolant: water, oil

Heating temperature of the second quenching (℃):-

Tempering heating temperature (℃): 540; Coolant: water, oil

Tensile strength（σ b/MPa):≥930

Yield point（σ s/MPa):≥785

Elongation after fracture（δ 5/%):≥12

Reduction of area（ψ/%):≥ fifty

Impact absorption energy (Aku2/J): ≥ 63

Brinell hardness (HBS100/3000) (annealing or high-temperature tempering state) ≤ 229

What are the advantages of 30CRMO steel?

There are many advantages of using 30CRMO steel for construction projects.30CRMO steel has excellent toughness and high strength, making it an ideal choice for applications that require superior strength and durability. The material also has excellent weldability and resistance to corrosion, making it a good choice for fabricating components that will be exposed to harsh environments.

What are the disadvantages of 30CRMO steel?

There are several disadvantages of 30CRMO steel that should be considered before using it for a project. First, its high carbon content makes it susceptible to cracking and warping. Second, its high chromium content can make it difficult to weld. Third, its high molybdenum content can make it difficult to work with. Finally, its high price tag can make it cost prohibitive for some projects.

What are the main features of 30CRMO Steel?

This steel has high strength and toughness, high hardenability, and the critical hardenability diameter in oil is 15~70mm; The thermal strength of steel is also good, and it has enough high temperature strength below 500 ℃, but its strength decreases significantly at 550 ℃; When the alloy element is at the lower limit, the welding is quite good, but when it is close to the upper limit, the weldability is medium, and it needs to be preheated to above 175 ℃ before welding; The steel has good machinability and medium plasticity during cold deformation; There is the first type of temper brittleness in the range of 300~350 ℃ during heat treatment; There is a tendency to form white spots.

What is the process of making 30CRMO Steel?

The process of making 30CRMO steel is rather complex and involves multiple steps. First, the raw materials must be gathered. These include iron ore, coal, and limestone. Next, these raw materials are placed in a blast furnace where they are heated to over 2,000 degrees Fahrenheit. This high temperature creates a molten liquid known as “pig iron.”

Now, the pig iron is transferred to a basic oxygen furnace (BOF). In the BOF, additional elements are added to the pig iron which will create the desired alloy composition for 30CRMO steel. These additional elements include chromium and molybdenum. Finally, the molten steel is poured into ingots or rounds where it will eventually be cold-worked into the desired shapes and sizes.

What are the applications of 30CRMO steel?

This kind of steel is usually used in the quenched and tempered state. When the carbon content is lower, it can also be used as carburized steel with higher core strength. In the medium-sized machinery manufacturing industry, it is mainly used to manufacture quenched and tempered parts with large section and working under high stress conditions, such as shafts, main shafts, and operating wheels, bolts, stud bolts, gears, etc. under high load; In the chemical industry, it is used to manufacture welded parts, welded structures composed of plates and pipes, and high-pressure conduits with a temperature not exceeding 250 ℃ working in the medium containing nitrogen and hydrogen; In the steam turbine and boiler manufacturing industry, it is used to manufacture fasteners under 450 ℃, flanges and nuts under high pressure under 500 ℃, and is especially suitable for manufacturing conduits under 300 atmospheric pressure and 400 ℃.

What is the difference between 35CrMoA and 30CrMo?

The difference between 35CrMoA and 30CrMo: “A” in 35CrMoA die steel plate means grade, which means high quality steel with low P and S content, also called grade 1 steel! Plus E represents super high quality steel, and B C represents grade II and grade III steel respectively. The performance of 30CrMoA is better than that of 35CrMo. Ordinary without “A”. The nut requires 30CrMo, which can be replaced by 35CrMoA, and the price may be slightly higher.

How to use 30CRMO Steel?

CRMO steels are a type of low alloy steel that have been infused with chromium, molybdenum and vanadium. The addition of these elements give the steel greater strength and resistance to wear and tear. This makes CRMO an ideal choice for construction projects or any application where durability is key. Here are a few tips on how to use CRMO steel:

When welding CRMO, be sure to use a low hydrogen electrode. This will help prevent cracking in the weld area.

If you’re working with CRMO tubing, it’s important to use a die set that is designed specifically for this material. This will help ensure a clean, accurate cut.

When machining CRMO, always use coolant to keep the tools from overheating. High temperatures can cause tool breakage and damage to the workpiece.