Precision Cold Rolled Seamless Steel Pipe 25crmo 34crmo 42CrMo 4130 4140 Precision Bright Tube

• Customization: Available
• Type: Seamless
• Technique: Cold Drawn
• Model NO.: 25CrMo 34CrMo 42CrMo 4130 4140
• Material: Carbon Steel
• Surface Treatment: Black
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Thickness: 4mm-150mm
• Length: 12m
• MOQ: 1 Ton
• Tolerance: ±5%, ±1%
• Delivery Time: 8-14 Days
• Oiled or Non-Oiled: Non-Oiled
• Processing Service: Punching, Bending, Decoiling
• Invoicing: by Actual Weight
• Product Name: Seamless Precision Steel Tube/Pipe
• Packages: Sea Worthy Packaging
• Standard: ASTM GB JIS DIN En
• Transport Package: Customized or Regular Shipping According to Custom
• Specification: OD 4-2420mm
• Trademark: MEIDE
• Origin: Shandong, China
• HS Code: 7304519090
• Production Capacity: 200000 Ton/Tons Per Month

Product Description

Product Description

Smaller outside diameter.
High precision can be used for small batch production
The cold-drawn finished product has high precision and good surface quality.
The cross area of steel pipe is more complex.
The performance of steel pipe is superior and the metal is dense. 1. Manufacturing method
According to different production methods, it can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe, extruded pipe, etc.
Hot-rolled seamless pipe is generally produced on the automatic pipe rolling mill. After inspection and removal of surface defects, the solid tube blank is cut to the required length, centered on the end face of the piercing end of the tube blank, and then sent to the heating furnace for heating and perforated on the piercing machine. At the same time, the piercing continues to rotate and move forward. Under the action of the roll and the plug, a cavity is gradually formed inside the tube blank, which is called the capillary. Then it is sent to the automatic pipe rolling mill to continue rolling. Finally, the wall thickness of the whole machine is uniform, and the diameter is determined by the sizing machine to meet the specification requirements. It is an advanced method to produce hot rolled seamless steel pipe by continuous pipe rolling mill.
In order to obtain seamless pipes with smaller size and better quality, cold rolling, cold drawing or both methods must be adopted. Cold rolling is usually carried out on a two-high mill, and steel pipes are rolled in a circular pass formed by a variable cross-section circular groove and a fixed conical plug. Cold drawing is usually carried out on 0.5~100T single-chain or double-chain cold drawing machine.
The extrusion method is to put the heated tube blank into the closed extrusion cylinder, and the piercing rod and the extrusion rod move together to extrude the extruded part from the smaller die hole. This method can produce steel pipes with smaller diameter.

Chemical Composition (%)

Material	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
ASTM 4119 GB 12CrMo	0.08-0.15	0.17-0.37	0.4-0.7	0.035	0.035	0.4-0.7	0.3	0.3	0.4-0.55
JIS SCM415 GB15CrMo	0.12-0.18	0.17-0.37	0.4-0.7	0.035	0.035	0.8-1.1	0.3	0.3	0.4-0.55
ASTM 4118 GB 20CrMo	0.17-0.24	0.17-0.37	0.4-0.7	0.035	0.035	0.8-1.1	0.3	0.3	0.15-0.25
ASTM 4130 GB 30CrMo	0.26-0.34	0.17-0.37	0.4-0.7	0.035	0.035	0.8-1.1	0.3	0.3	0.15-0.25
ASTM 4135 GB 35CrMo	0.32-0.4	0.17-0.37	0.4-0.7	0.035	0.035	0.8-1.1	0.3	0.3	0.15-0.25
ASTM 4140  GB 42CrMo	0.38-0.45	0.17-0.37	0.5-0.8	0.035	0.035	0.9-1.2	0.3	0.3	0.15-0.25
ASTM 4142 GB 42CrMnMo	0.4-0.45	0.15-0.35	0.78-1	0.035	0.04	0.8-1.1	0.25	0.35	0.15-0.25

Mechanical property

Material	Diameter of sample d mm	Heat treatment or condition.	Tensile strength σb Mpa	Point of yield σs Mpa	Ratio of elongation δ %	Reduction of section ψ %	hardness HBW	Shock absorption energy KV2 J
ASTM 4119 GB 12CrMo	d=30	Quenching + tempering	≥410	≥265	≥24	≥60	≤179	≥110
JIS SCM415 GB 15CrMo	d=30	Quenching + tempering	≥440	≥295	≥22	≥60	≤179	≥94
ASTM 4118 GB 20CrMo	d=15	Quenching + tempering	≥885	≥685	≥12	≥50	≤197	≥78
ASTM 4130 GB 30CrMo	d=25	Quenching + tempering	≥930	≥785	≥12	≥50	≤229	≥63
ASTM 4135 GB 35CrMo	d=25	Quenching + tempering	≥980	≥835	≥12	≥45	≤229	≥63
ASTM 4140  GB 42CrMo	d=25	Quenching + tempering	≥1080	≥930	≥12	≥45	≤217	≥63

Heat treatment process

Annealing is to heat the cold-rolled precision bright steel pipe to a proper temperature, adopt different holding time according to the material and workpiece size, and then slowly cool it, in order to make the internal structure of the metal reach or close to the equilibrium state, obtain good technological properties and service properties, or prepare the structure for further quenching.
Normalizing is to heat the cold-rolled precision bright steel pipe to a suitable temperature and then cool it in the air. The effect of normalizing is similar to that of annealing, but the obtained microstructure is finer, which is often used to improve the cutting performance of materials, and sometimes used for the final heat treatment of parts with low requirements.
Quenching refers to the rapid cooling of cold rolled precision bright steel pipes in water, oil or other inorganic salts, organic water solutions and other quenching media after heating and heat preservation. After quenching, the cold-rolled precision bright steel pipe becomes hard, but brittle at the same time.
In order to reduce the brittleness of cold-rolled precision bright steel pipes, the quenched cold-rolled precision bright steel pipes are kept for a long time at an appropriate temperature higher than room temperature but lower than 650 ºC, and then cooled. This process is called tempering.
Annealing, normalizing, quenching and tempering are the "four fires" in the overall heat treatment. Among them, quenching and tempering are closely related and often used together.

Product specification

Specification: outer diameter of hot-rolled pipe is 32~630mm. The wall thickness is 2.5~75mm. The outer diameter of cold rolled (cold drawn) pipe is 5~200mm. The wall thickness is 2.5~12mm.
Appearance quality: the internal and external surfaces of steel pipes shall be free of cracks, folds, folds, delamination, hairlines and scabs. These defects shall be completely removed, and the wall thickness and outer diameter shall not exceed the negative deviation after removal.
Both ends of the steel pipe shall be cut at right angles and the burrs shall be removed. Gas cutting and hot saw cutting are allowed for steel pipes with wall thickness greater than 20mm. The head may not be cut after the agreement between the supplier and the supplier.
Refer to GB3639-83 for Surface Quality of cold-drawn or cold-rolled precision seamless steel pipes.

product application

Seamless pipes are widely used. Seamless pipes for general purposes are rolled by ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with the largest output, and are mainly used as pipes or structural parts for conveying fluid.
Supply is divided into three types according to different purposes: a. Supply according to chemical composition and mechanical properties; B. Supply according to mechanical properties; C. Supply according to hydraulic test. The steel pipes supplied according to category a and b shall also be subjected to hydraulic test if they are used to bear liquid pressure.
There are many kinds of seamless pipes for special purposes, such as boiler seamless pipes, geological seamless pipes and petroleum seamless pipes.

 

FAQ

Q1:who are we?
A:We are based in Shandong, China, start from 2022,sell to North America(60.00%),Western Europe(14.00%),South America(6.00%).There are total about 11-50 people in our office.

Q2:What is a seamless steel pipe?
A:Seamless steel pipes are perforated from whole round steel, and steel pipes without welds on the surface are called seamless steel pipes.,

Q3:What is the difference between ERW and seamless steel pipe?
A:Seamless pipe is manufactured by extruding the metal to the desired length; therefore ERW pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length.,

Q4:What is seamless steel pipe used for?
A:Seamless steel pipe is regularly used in the transportation of fluids such as water, natural gas, waste and air. 

Q5.what services can we provide?
A:Accepted Delivery Terms: FOB,CFR,CIF,EXW;
Accepted Payment Currency:USD,EUR,JPY,CAD,AUD,HKD,GBP,CNY,CHF;
Accepted Payment Type: T/T,L/C,D/P D/A,PayPal;
Language Spoken:English,Chinese

Q6.Can we get the some samples?Any charges?
A:Yes,you can get available samples in our stock.Free for real samples,but customers need to pay the freight cost.

Q7.How can we get your price ?
A:We need below information to quote for you:
1). Product Name
2). Standard
3). Material Grade (Chemical Composition)
4). Dimension
5). Quantity
6). The Drawing for Special Parts