Outside PE composite coated plastic pipe, Coated (rolled) plastic composite steel pipe without diameter restrictions, the thickness of the lining layer can also be arbitrarily selected, according to the corrosion medium conditions, choose different lining thickness, length can also reach 6-12 meters; The same nominal diameter, coated (rolled) plastic composite steel pipe lining is generally between 0.5-1mm, smooth tube surface, not only the friction coefficient is small, and the friction coefficient is also small, the fluid loss in the tube is small, the transmission flow is large, to achieve energy saving. In recent years, the anti-corrosion spiral steel pipes are widely used in building water supply and drainage, drinking water distribution pipelines engineering, fire control, for the most fire pipeline steel pipe before use hot dip galvanized steel pipe, many community, hotels, office buildings are now using epoxy powder anticorrosive steel pipe with both sides plastic coated is applied to both inside and outside as fire pipe material, its appearance beautiful and durable, It has become a major product of emerging industries in the 21st century. PE inside EP coated plastic steel tube professional sales of powder coated plastic steel tube added flame retardant and modified epoxy resin powder, the temperature resistance of the coating is superior, in long-term use does not burn, do not soften.Polyethylene powder coating, POLYvinyl chloride powder coating, polypropylene powder coating, chlorinated polyether powder coating, nylon powder coating, polyphenylene sulfide powder coating, etc., these thermoplastic powder coatings have advantages and disadvantages. Thermosetting plastics have better curing levelling and wettability because of their small molecular weight, which makes them strong adhesion to the tube body when coating steel tube, and can make coated steel tube get a smooth plastic film surface. Commonly used thermosetting plastics are: epoxy resin, phenolic resin, amino resin and so on. The thickness of the coating wall is between 100 microns and 500 microns, usually 350 microns. Outside PE composite coated plastic pipe, 1. Health, non-toxic, no scaling, no breeding of microorganisms, ensure the quality of fluid 2. 3. The installation process is mature, convenient and fast, and the connection with ordinary galvanized pipe is the same. 4. Good weather resistance. 5. Smooth pipe wall, improve conveying efficiency, long service life. Outside PE composite coated plastic pipe, Connection mode: thread connection: use manual die twisted wire or electric wire sleeve machine to process pipe thread, pay attention to cooling during processing; Flange connection, on-site measurement, drawing pipeline single line processing map, processing coating, plastic lining, and then transported to the site installation; Non-coated, lined plastic steel pipe and pipe fittings can be used in the field, flange welding, assembling pipeline, and then disassembled for coating, lined plastic processing, and then transported to the site installation; Finished grooved coated plastic pipe fittings should be preferred; Grooves shall be pressed by groove rolling machine, and the grooves shall be in accordance with the relevant standards.The paint film of epoxy powder anticorrosive steel tube is tough, water resistant and non-toxic. Strong adhesion, good adhesion between paint film and paint film. Excellent anti-rust and water resistance, the use of excellent anti-rust raw materials, to ensure its anti-rust performance. It has good mechanical strength, tough film, abrasion resistance and impact resistance. High solid content, thick film. The molecular structure of epoxy powder anticorrosive steel pipe is characterized by the active epoxy groups in the molecular chain, which can be located at the end, middle or ring structure of the molecular chain. Because of the active epoxy groups in the molecular structure, they can crosslink with various types of curing agent to form insoluble and infusible polymers with three-way network structure. Thermosetting powder coatings are mainly used in various countries: epoxy powder coatings, epoxy phenolic powder coatings, polyester powder coatings, epoxy-polyester powder coatings. Among them, epoxy powder coating is the early variety of application, is also the current production of plastic powder coating, widely used in electrostatic spraying process, in decorative coating plays a very important position; Because of its high chemical corrosion resistance, epoxy phenolic powder coating is mostly used for anti-corrosion coating.

Grade	C	Mn	Si	S	P	UTS(MPa)	YS(MPa)	EI(%)
Q235B	0.12-0.20	0.30-0.70	0.30	0.045	0.045	375-500	235	26
Q345B	0.12-0.20	1.20-1.60	0.20-0.55	≤0.045	≤0.045	510-600	345	22
20#(GB)	0.17-0.23	0.38-0.65	0.17-0.37	≤0.030	≤0.030	410-550	≥245	≥20

HDPE PIPE SIZES CHART
Dia	Deviation	0.4Mpa	0.5Mpa	0.6Mpa	0.8Mpa	1.0Mpa	1.25Mpa	1.6MPa	2.0Mpa
		Thickness	Thickness	Thickness	Thickness	Thickness	Thickness	Thickness	Thickness
mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	0.3								2.3
20	0.3							2.3	2.3
25	0.3						2.3	2.3	3
32	0.3					2.3	2.4	3	3.6
40	0.4				2.3	2.4	3	3.7	4.5
50	0.4			2.3	2.4	3	3.7	4.6	5.6
63	0.4			2.5	3	3.8	4.7	5.8	7.1
75	0.5			2.9	3.6	4.5	5.6	6.8	8.4
90	0.6			3.5	4.3	5.4	6.7	8.2	10.1
110	0.7			4.2	5.3	6.6	8.1	10	12.3
125	0.8			4.8	6	7.4	9.2	11.4	14
140	0.9			5.4	6.7	8.3	10.3	12.7	15.7
160	1			6.2	7.7	9.5	11.8	14.6	17.9
180	1.1			6.9	8.6	10.7	13.3	16.4	20.1
200	1.2			7.7	9.6	11.9	14.7	18.2	22.4
225	1.4			8.6	10.8	13.4	16.6	16.6	25.2
250	1.5			9.6	11.9	14.8	18.4	22.7	27.9
280	1.7			10.7	13.4	16.6	20.6	25.4	31.3
315	1.9	7.7	9.7	12.1	15	18.7	23.2	28.6	35.2
355	2.2	8.7	10.9	13.6	16.9	21.1	26.1	32.2	39.7
400	2.4	9.8	12.3	15.3	19.1	23.7	29.4	36.3	44.7
450	2.7	11	13.8	17.2	21.5	26.7	33.1	40.9	50.3
500	3	12.3	15.3	19.1	23.9	29.7	36.8	45.4	55.8
560	3.4	13.7	17.2	21.4	26.7	33.2	41.2	50.8	62.5
630	3.8	15.4	19.3	24.1	30	37.4	46.3	57.2	70.3
710	6.4	17.4	21.8	27.2	33.9	42.1	52.2	64.5	79.3
800	7.2	19.6	24.5	30.6	38.1	47.4	58.8	72.6	89.3
900	8.1	22	27.6	34.4	42.9	53.3	66.2	81.7
1000	9	24.5	30.6	38.2	47.7	59.3	72.5	90.2