Seamless Steel Pipe Hydraulic Alloy Precision Steel Tube Q235C E235 Ust37-2 Sm400A Q235D Sm400b Precision Steel Pipe

• Customization: Available
• Type: Seamless
• Technique: Cold Drawn
• Model NO.: Q235C E235 USt37-2 SM400A Q235D SM400B
• 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	component	C	Si	Mn	P	S	Cr	Ni	Cu
ASTM 1320 GB 20Mn2	minimum value	0.17	0.17	1.4	-	-	-	-	-
	maximum value	0.24	0.37	1.8	0.035	0.035	0.3	0.3	0.3
ASTM 1330 GB 30Mn2	minimum value	0.27	0.17	1.4	-	-	-	-	-
	maximum value	0.34	0.37	1.8	0.035	0.035	0.3	0.3	0.3
ASTM 1335 GB 35Mn2	minimum value	0.32	0.17	1.4	-	-	-	-	-
	maximum value	0.39	0.37	1.8	0.035	0.035	0.3	0.3	0.3
ASTM 1340 GB 40Mn2	minimum value	0.37	0.17	1.4	-	-	-	-	-
	maximum value	0.44	0.37	1.8	0.035	0.035	0.3	0.3	0.3
ASTM 1345 GB 45Mn2	minimum value	0.42	0.17	1.4	-	-	-	-	-
	maximum value	0.49	0.37	1.8	0.035	0.035	0.3	0.3	0.3
GB 50Mn2 DIN 50Mn7	minimum value	0.47	0.17	1.4	-	-	-	-	-
	maximum value	0.55	0.37	1.8	0.035	0.035	0.3	0.3	0.3
DIN 20MnV6 1.5217 GB 20MnV	minimum value	0.17	0.17	1.3	-	-	-	-	-
	maximum value	0.24	0.37	1.6	0.035	0.035	0.3	0.3	0.3

Mechanical property

Material	Diameter (thickness) d mm	tensile strength σ b Mpa	Yield point σ s Mpa	Elongation or elongation after fracture δ %	Hardness HBW	Impact absorbed energy KV2 J
ASTM 1320 GB 20Mn2	d=15	≥785	≥590	≥10	≤187	≥47
ASTM 1330 GB 30Mn2	d=25	≥785	≥635	≥12	≤207	≥63
ASTM 1335 GB 35Mn2	d=25	≥835	≥685	≥12	≤207	≥55
ASTM 1340 GB 40Mn2	d=25	≥885	≥735	≥12	≤217	≥55
ASTM 1345 GB 45Mn2	d=25	≥885	≥735	≥10	≤217	≥47
GB 50Mn2 DIN 50Mn2	d=25	≥930	≥785	≥9	≤229	≥39
DIN 20MnV6 1.5217 GB 20MnV	d=15	≥785	≥590	≥10	≤187	≥55

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. how can we guarantee quality?
A:Always a pre-production sample before mass production;
Always final Inspection before shipment;

Q3.what can you buy from us?Which ports are accepted for delivery?
A:Copper,Aluminum,Mould steel, Seamless carbon steel,Precision steel pipe,The steel plate,Alloy steel,Titanium,Custom machine parts.It can be delivered from Qingdao, Tianjin, Shanghai, Guangzhou and other ports.

Q4.why should you buy from us not from other suppliers?
A:Shandong Meide Import and Export Co., Ltd. has 25 years of production experience. With advanced precision production equipment
and modern large warehouses, has a stockpile of 200,000 tons of goods, has a number of long-term stable cooperative customers.

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