boiler pressure pipe

Manufacture and use of boiler pressure pipe

(1) Manufacturing method:

①The operating temperature of general boiler tubes is below 450°C, and domestic tubes are mainly made of No. 10 and No. 20 carbon-structured steel hot-rolled or cold-drawn tubes.
②High-pressure boiler tubes are often exposed to high-temperature and high-pressure conditions during use, and the tubes will be oxidized and corroded under the action of high-temperature flue gas and water vapor. Steel pipes are required to have high durable strength, high resistance to oxidation and corrosion, and good structural stability.

(2) Uses:

①General boiler tubes are mainly used to manufacture water-cooled wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes, and arch brick tubes.
②High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, gas guide tubes, main steam tubes, etc. of high-pressure and ultra-high pressure boilers.
The production process of high-pressure boiler tubes varies with different steel types. Taking pearlitic chromium molybdenum vanadium steel as an example, the production process characteristics of boiler tubes are: (1) The tube blank should be peeled, and the peeling amount is usually 5mm; (2) Because the steel is hard, the tube blank is often cut or sawed with oxygen; (3) Since the thermal conductivity of chromium-molybdenum-vanadium steel is lower than that of carbon steel, the heating rate should be slightly slower, the heating temperature is 1120-1180°C, and the piercing temperature is 1100-1160°C; (4) This type of steel is in the range of 1000-1100°C It has good plasticity and low deformation resistance, so the perforation performance is better, and the deformation parameters can be selected according to medium carbon steel or alloy steel (such as 30CrMnSiA); (5) After rolling, the steel pipe should be normalized and tempered, and the normalizing temperature is 950 ~980°C, tempering temperature is 730~750°C, and holding time is 2~3h; (6) The dimensional tolerance of the steel pipe is strict to ensure butt welding; the length of the pipe should be as long as possible to reduce the number of welds.

Chemical Composition and Mechanical Properties of boiler pressure pipe

Speci -cation	Grade	Chemical Composition [%]															Mechanical Properties
		C		Mn		P	S	Si		Cr		Mo		Cu	Ni	V	Yield Strength		Tensile Strength			% Elongation (G.L. 50 mm WT 8 mm) e (min.)
		C		Mn		P	S	Si		Cr		Mo		Cu	Ni	V	Min.		Min.
		Min	Max.	Min	Max.	Max.	Max.	Min.	Max	Min.	Max	Min.	Max	Max	Max	Max	PSI	MPa	PSI	MPa
SEAMLESS COLD DRAWN PRECISION STEEL TUBES FOR MECHANICAL APPLICATIONS/HYDRAULIC/PNEUMATIC POWER SYSTEMS
EN 10305-1/ EN10305-4	E 235 E 355		0.17 0.22		1.2 1.6	0.025 0.025	0.025 0.025		0.35 0.55							0.02 0.02		235 355		340 490	25 22
EN 10216-1	P195 TR1 P235 TR1		0.13 0.16		0.7 1.2	0.025 0.025	0.02 0.02		0.35 0.35		0.3 0.3		0.08 0.08	0.3 0.3	0.3 0.3			195 235		320 360	27 25
EN 10216-2	P235 GH		0.16		1.2	0.025	0.02		0.35		0.3		0.08	0.3	0.3	0.02
DIN 2391	St - 45 St - 45 St - 52	- - -	0.17 0.21 0.22	0.40 0.40 -	- - 1.60	0.025 0.025 0.025	0.025 0.025 0.025	- - -	0.35 0.35 0.55	- - -	- - -	- - -	- - -	- - -	- - -	- - -	NBK : 215 / GBK : - NBK : 255 / GBK : - NBK : 355 / GBK : -		NBK : 340 / GBK : 315 NBK : 440 / GBK : 390 NBK : 490 / GBK : 490		NBK : 470 NBK : 570 NBK : 630
ASTM A-519	SAE 1010 SAE 1018 SAE 1026 SAE 1035 SAE 1040 SAE 1518 SAE 1541 SAE 4130	0.08 0.15 0.22 0.32 0.37 0.15 0.36 0.28	0.13 0.20 0.28 0.38 0.44 0.21 0.44 0.33	0.30 0.60 0.60 0.60 0.60 1.10 1.35 0.40	0.60 0.90 0.90 0.90 0.90 1.40 1.65 0.60	0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040	0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.040	- - - - - - - 0.15	- - - - - - - 0.35	- - - - - - - 0.80	- - - - - - - 1.10	- - - - - - - 0.15	- - - - - - - 0.25	- - - - - - - -	- - - - - - - -	- - - - - - - -	As per Customer requirements
BOILER/HEAT EXCHANGER/SUPERHEATER & CONDENSER TUBES
ASTM A179	-	0.06	0.18	0.27	0.63	0.035	0.035	-	-	-	-	-	-	-	-	-	26,000	180	47,000	325	35
ASTM A192		0.06	0.18	0.27	0.63	0.035	0.035	-	0.25	-	-	-	-	-	-	-	26,000	180	47,000	325	35
ASTM A 210	A-1 C	- -	0.27 0.35	- 0.29	0.93 1.06	0.035 0.035	0.035 0.035	0.10 0.10	- -	- -	- -	- -	- -	- -	- -	- -	37,000 40,000	255 275	60,000 70,000	415 485	30 30
ASTM A 213	T-11 T-12 T-22	0.05 0.05 0.05	0.15 0.15 0.15	0.30 0.30 0.30	0.60 0.61 0.60	0.025 0.025 0.025	0.025 0.025 0.025	0.50 - -	1.00 0.50 0.50	1.00 0.80 1.90	1.50 1.25 2.60	0.44 0.44 0.87	0.65 0.65 1.13	- - -	- - -	- - -	30,000 32,000 30,000	205 220 205	60,000 60,000 60,000	415 415 415	30 30 30
ASTM A335	P-11 P-12 P-22	0.05 0.05 0.05	0.15 0.15 0.15	0.30 0.30 0.30	0.60 0.61 0.60	0.025 0.025 0.025	0.025 0.025 0.025	0.50 - -	1.00 0.50 0.50	1.00 0.80 1.90	1.50 1.25 2.60	0.44 0.44 0.87	0.65 0.65 1.13	- - -	- - -	- - -	30,000 32,000 30,000	205 220 205	60,000 60,000 60,000	415 415 415	30 30 30
BS 3059 Pt I	320	-	0.16	0.30	0.70	0.040	0.040	0.10	0.35	-	-	-	-	-	-	-	28,000	195	46,000	320	69,500
BS 3059 Pt II	622-490	0.08	0.15	0.40	0.70	0.030	0.030	-	0.50	2.00	2.50	0.90	1.20	-	-	-	40,000	275	71,000	490	93,000
DIN 1629	St- 37.0 St - 52	- -	0.17 0.22	- -	- -	0.040 0.040	0.040 0.035	- -	- -	- -	- -	- -	- -	- -	- -	- -	WT 16mm = 235 / WT>16mm = 225 WT 16mm = 355 / WT>16mm = 345		350 -		- Long 21 / Trans 19
DIN 17175	St - 35.8 St - 45.8	- -	0.17 0.21	0.40 0.40	0.80 1.20	0.040 0.040	0.040 0.040	0.10 0.10	0.35 0.35	- -	- -	- -	- -	- -	- -	- -	WT 16mm = 235 / WT>16mm = 225 WT 16mm = 255 / WT>16mm = 245		360 410		480 530

Product Specification of High pressure boiler tube

Product Name	High pressure boiler tube
Material	GR.B,ST52, ST35, ST42, ST45,X42, X46, X52, X56, X60, X65, X70,SS304, SS316 etc.
Size	Size 1/4" to 24" Outside Diameter 13.7 mm to 610 mm
Standard	API5L , ASTM A106 Gr.B, ASTM A53 Gr.B, ANSI A210-1996, ANSI B36.10M-2004 , ASTM A1020-2002,ASTM A179-1990 ,BS 3059-2,DIN 17175 ,DIN 1630 ,DIN 2448
Certificates	API5L, ISO 9001:2008,SGS, BV,CCIC
Wall thickness	SCH10, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100 SCH120, SCH160, XS, XXS
Surface Treatment	black paint, varnish, oil, galvanized, anti corrosion coatings
Marking	Standard marking, or according to your request. Marking Method: Spray white paint
Pipe Ends	Under 2 inch plain end. 2 inch and above Beveled. Plastic caps (small OD) ,Iron protector (large OD)
Pipe Length	1. Single Random Length and double Random Length. 2. SRL:3M-5.8M DRL:10-11.8M or As clients requested length 3. fixed length(5.8m, 6m, 12m)
Packaging	Loose package; Packaged in bundles(2Ton Max); bundled pipes with two slings at the both end for easy loading and discharging; End with Plastic caps; wooden cases.
Test	Chemical Component Analysis, Mechanical Properties, Technical Properties, Exterior Size Inspection, hydraulic testing , X-ray Test.
Application	liquid delivery; Structure pipe; High and low pressure Boiler tube; Seamless steel tubes for petroleum cracking; oil pipe; gas pipe
Advantages	1.Reasonable price with excellent quality 2.Abundant stock and prompt delivery 3.Rich supply and export experience, sincere service 4.Reliable forwarder, 2-hour away from port.

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boiler pressure pipe production line

Shandong Kuaima Steel Co., Ltd. has advanced special smelting, investment casting, pipe making and other production equipment. The company has 15 advanced production lines, which can independently produce boiler pressure pipe，hot/cold rolled steel, galvanized steel, galvanized steel, prepainted steel and stainless steel coils, strips, plates, plates, pipes, bars and other products. The standing inventory is more than 450,000 tons to meet the customer's demand for delivery time.

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boiler pressure pipe application industry

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