HOW MANY TYPES OF SEAMLESS STEEL TUBE

Seamless steel tube has many types: hot rolling seamless steel tube, cold rolled seamless steel tube, cold drawn seamless steel tube.

Normal seamless steel tube:

High quality carbon structural steel:10#,20#,30#,35#,45# etc

Low alloy structural steel : 16Mn, 5Mnv and so on.

Alloy steel: 40Cr, 30CrMnSi,45Mn2 etc.

What’s application of the seamless steel tube?

10#,20# low carbon steel is used for fluid pipeline.

45#，40Cr middle carbon steel apply to mechanical parts: automotive spare parts.

Hot rolling steel tube is divided to low or middle pressure boiler pipes,high pressure boiler tubes, alloy steel tube, stainless steel tube, oil cracking tubes , geological steel tubes and other steel tube.

Cold rolled or cold drawn seamless steel pipe is divided to normal steel pipe, low pressure boiler pipes, middle pressure boiler tubes, high pressure boiler steel tube, alloy steel tube, stainless steel tube.

HOT ROLLING SEAMLESS STEEL TUBE:

Hot rolling seamless steel tube is produced through hot rolled craft, it is a kind of mechanical structural member.

What’s meaning of hot rolling?

Hot rolling refers to pipes be produced in temperature above recrystallization temperature.( The lowest recrystallization temperature is aTm(K),industrial pure metal “a” =0.35-0.4. High pure metal “a” =0.25-0.35. “Tm “refers to the melting point of metal, “K” means K fahrenhelt.

Size of hot rolling seamless steel tube?

Outside diameter is more than 32mm.

Thickness:2.5-75mm

What’s the advantages and disadvantages of hot rolling seamless steel tube?

Preponderance:

1. Lower cost

2. Higher plasticity, lower deformation resistance.

Disadvantages:

1. This is a stratification after the nonmetallic sundries are turned into thin slices. It means seamless steel tube is easy to be cracked.

2. Due to the residual stress caused by uneven cooling.It affects deformation, stability , fatigue resistance of seamless steel tube.

3. It is difficult to control the thickness and inner diameter.

What’s meaning of cold rolled (cold drawn) seamless steel tube?

Cold rolled or cold drawn seamless steel tube is produced by many times of cold drawing process. It produced in 0.5-100T single or double chain cold drawing machine.

Size of cold rolling or cold drawn seamless steel tube?

Outside diameter:6-90mm

Thickness:0.25-20mm

What’s the advantages and disadvantages of cold rolled or cold drawn seamless steel tube?

Preponderance:

1.High precision:

Cold rolled seamless steel tube and cold drawn seamless steel tube with high precision:

Cold rolled seamless steel tube outside diameter and ID tolerance:+/-0.05mm/+/-0.03mm

Cold drawn seamless steel tube outside diameter and ID tolerance:+/-0.1mm

2.Perfect performance:

Cold rolled seamless steel pipe can be used for gas spring, shock absorber, automotive spare parts ,fluid pipeline etc.

Cold drawn steel tube most be used for machinery manufacturing,

3.Precise steel tube size be controlled.

 

Disadvantages:

More production process with high cost.

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