Anti-corrosion Coating for Steel Pipe

Nowadays, anti-corrosion coated steel pipe is widely used in urban underground pipe network for transporting gas, oil, water, etc. Since the pipeline need to be buried in the soil for a quite long time, so it requires water resistance, chemical resistance and other long-term corrosion resistance. Besides, anti-corrosion coated steel pipe should meet a variety of performance to make sure the pipeline could be transport, storage and embedded in the process. For example, the pipeline should meet a specific properties such as impact resistance, abrasion resistance, compressive strength, hardness, corrosion resistance, ductility, elongation strength. The importance of these properties varies by the use of different environments, construction methods and material differences. 

Polyethylene tape coating:

Polyethylene tape is one of the main anti-corrosion mateiral widely used on pipeline. The using temperature ranges from -30 degrees to 70 degrees and it has good impact resistanc, static pressure, water tightness and other properties. The coating process is simple, convenient, affordable, so it is widely accepted by the users. When using polyethylene tape as anti-corrosion coating, the different thickness and different width of the tape is depending on the anti-corrosion requirements and different construction methods. 

Epoxy powder coating:
Epoxy powder caoting is appread in the 1960s, it is applied by electrostatic spraying method. The powder is spraded onto the pre-heated tube surface, and then a dense layer coating formed after the tube cool down. The advantages for this type of coating is have good corrosion resistance, less environmenetal pollution, wide using temperature range ( ranges from 60 degrees to 100 degrees), large tube adhesion, impact resistance, less welding damage, water resistance, electrical insulation etc. While the disadvantages are vulnerable to inquiry, high technical requirements, complex equipment needed. Therefore, it is very difficult to manage the construction filed. Different manufacturers, or even different batches of product performance differences. We advise the purchasers, when they make the desicion, their choice should focus on its mechanical properties and adhesion resistance.

The using time for buried pipeline is critical. So far, PE anti-corrotion coating is considered to be the most advanced coating in the world due to its chemical stability, mechanical resistance, scratch resistance etc.

Seamless Boiler Tube, Seamless Boiler Pipe

It takes an uncompromising level of quality to manufacture pressure tubing and piping. PRIME STEEL PIPE understands the critical end-use applications and maintains the strictest production standards and procedures required to meet the precise ASTM/ASME specifications applied for heat exchangers, condensers and boilers. We offer complete, non-destructive testing equipment to ensure our products consistently meet our customer's specifications and worldwide quality standards.

SEAMLESS BOILER TUBE & PIPE:
OD: 25.4mm ~ 168.3mm, WT: 1mm ~ 50mm, LENGTH: max 22 mtr
ASTM A106, ASTM A179M, ASTM A192M, ASTM A209M, ASTM A210M,
ASTM A213M, ASTM A355M, DIN 17175, JIS G3456, JIS G3461, JIS 3462, EN 10216

 

Different Types of Pipe Surface Finish you need to know

The Type of Pipe Surface Funish

1. 3LPE (three layer polyethylene coating)
It layered with epoxy (green) first, and then applied the second layer of adhesive (white),  in the end finished the coating by polyethylene (black).
The thickness of the 3LPE ranges from 2.0mm to 4.5mm.
  

2. Bare Pipes --- Finish the pipes with no caoting.
  

3. Black Varnished --- Applyed with 1 or 2 layers of black paint.
  

4. Galvanized --- Hot-dipped Galvanized, Electric Galvanized

  

5. Oiled --- Brushed with oil
  ​

Large-diameter LSAW Steel Pipe Production Process

Large-diameter LSAW steel pipe production process mainly explained: 

1. plate probe: used to manufacture large diameter submerged arc welded steel pipe joints straight after entering the production line, the first full-board ultrasonic testing; 

2. Milling: Milling machine through the two-sided edge of the milling plate, so as to meet the requirements of the plate width, the plate sides parallel to the groove shape and degree; 

3. Pre-curved side: the use of pre-bending machine pre-bending plate edge, the edge of the plate has to meet the requirements of curvature; 

4. Forming: in the first half of JCO molding machine after the pre-bending step after several stamped steel, pressed into a "J" shape, and then the other half of the same steel plate bent, pressed into a "C" shape, forming the final opening The "O"-shaped 

5. Pre-welding: make a straight seam welded steel pipe after forming and using gas welding seam (MAG) for continuous welding; 

6. Inside weld: a tandem multi-wire submerged arc welding (up to four wire) on the inside straight seam welded steel pipe; 

7. Outside weld: a tandem multi-wire submerged arc welding on the outside LSAW steel pipe welding; 

8. Ultrasonic testing: inside and outside of the straight seam welded steel pipe weld and weld both sides of the base material 100% inspection; 

9. X ray inspection: 100% weld on the inside and outside of the X-ray industrial TV inspection using image processing system to ensure detection sensitivity; 

10. Expansion:For submerged arc welding and straight seam steel pipe length hole diameter in order to improve the size precision of steel tube, and improve the distribution of stress in steel tube;

11. Hydraulic test: On the hydraulic test machine for steel after expanding by-root test to ensure that the steel pipe to test pressure requirements of the standard, the machine has an automatic recording and storage capabilities;

12. Chamfering: the steel pipe inspection conducted after the end of processing to the pipe end beveling size requirements.

Do you know the Using Advantages of Galvanized Steel Pipes ?

Galvanized Steel Pipes are widely used in many fields, do you know the reason why is so popular?Below is three main using advantages of Galvanized Steel Pipes you might want to know:


1. After being hot-dip galvanized, the pipes of the surface will be protected well. Compared with other type of coating process, deepen the zinc is easier to let the coating covered well.


2. Because the zinc coating has a larger hardness value than steel pipes. After being galvanized, the impact resistance and anti-ware properties of the steel pipes has increased.


3. In general, the zinc layer at the pipe ends will be relatively thicker than other type of coatings. Therefore, it offers better toughness and abrasion resistance to the Galvanized Steel Pipes.

GB/T8162 Seamless Steel Pipe

GB/T8162 seamless steel pipe 

Application: Suitable for general structure, seamless steel pipe for mechanical structure.

Steel Grade:10、20、35、45、16Mn、12CrMo、15CrMo、12Cr1MoV.

Mechanical properties:

Standard	Steel grade	Tensile strength (MPa)	Yield strength (MPa)	Elongation (%)
GB/T8162	10	≥ 335	≥ 205	≥ 24
	20	≥ 390	≥ 245	≥ 20
	35	≥ 510	≥ 305	≥ 17
	45	≥ 590	≥ 335	≥ 14
	16Mn	≥ 490	≥ 325	≥ 21
	12CrMo	≥ 410	≥ 265	≥ 24
	15CrMo	≥ 440	≥ 295	≥ 22
	12Cr1MoV	≥ 490	≥ 245	≥ 22

Chemical compositions:

Standard	Steel grade	Chemical composition
		C	Si	Mn	P、S	Cu	Ni	Mo	Cr
GB/T8162	10	0.07～0.14	0.17～0.37	0.35～0.65	≤0.035	≤0.25	≤0.25	/	≤0.15
	20	0.17～0.24	0.17～0.37	0.35～0.65	≤0.035	≤0.25	≤0.25	/	≤0.25
	35	0.32～0.40	0.17～0.37	0.50～0.80	≤0.035	≤0.25	≤0.25	/	≤0.25
	45	0.42～0.50	0.17～0.37	0.50～0.80	≤0.035	≤0.25	≤0.25	/	≤0.25
	16Mn	0.12～0.20	0.20～0.55	1.20～1.60	≤0.035	≤0.25	≤0.25	/	≤0.25
	12CrMo	0.08～0.15	0.17～0.37	0.40～0.70	≤0.035	≤0.25	≤0.30	0.40～0.55	0.40～0.70
	15CrMo	0.12～0.18	0.17～0.37	0.40～0.70	≤0.035	≤0.25	≤0.30	0.40～0.55	0.80～1.10
	12Cr1MoV	0.08～0.15	0.17～0.37	0.40～0.70	≤0.035	≤0.25	≤0.30	0.25～0.35	0.90～1.20

                  

API 5L X60 Carbon Steel Pipe

API 5L X60 PSL 1 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B. Application: gas, water and oil transportation in both oil and natural gas.

Chemical composition of API 5L X60

Products	C	Si	Mn	P	S	V	Nb	Ti
API 5L X60 seamless steel pipe	≤0.28	≤0.45	≤1.60	≤0.03	≤0.01	≤0.15	≤0.05	≤0.04
API 5L X60 welded steel pipe	≤0.26	≤	≤1.60	≤0.03	≤0.01	≤0.15	≤0.05	≤0.04

Mechanical properties of API 5L X60

Standard	Tensile strength (Mpa)	Yield strength (Mpa)	Elongation (%)
API 5L X60	≥435	≥320	≥28