Boiler tubes

 Boiler tubes are used in heat exchange appliances in which the energy is transferred from one medium to the other.

How to choose good quality boiler tubes?

While choosing boiler tubes, look for the following to pick out the right and good quality tubes:

1. Look at the cross-section of the tube. A good quality seamless tube will have a smooth cross-section and will be devoid of bumps and irregularities.
2. Check the density of the pipe to understand the percentage of impurities in the pipe. If the pipe shows low density, steer clear!
3. Check the surface of the boiler tube. A good quality boiler tube will have a smooth surface. If you find the surface to be rough and uneven, you can be sure that the quality is not up to the mark.

Quality Assurance

We have capability and capacity to ensure boiler tube in superior condition, with advanced inspection and testing procedures, standard tests include dimensional examination, visual checking, chemical composition, mechanical properties as well as non destructive test 100% eddy current test.

Fire Tube Boiler

Fire-tube boiler is a type of boiler in which hot gas passes from the fire through one or more pipes that pass through a sealed water container. The heat of the gas is transferred through the wall of the tube through heat conduction, heating the water and eventually generating steam. Fire tube boilers are the third of the four historical types of boilers: low-pressure tank or “haystack” boilers, flue boilers with one or two large flues, fire tube boilers and high-pressure boilers with many small tubes

Water Tube Boiler

Water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. The fuel is burned in the furnace to produce hot gas, which heats the water in the steam generation tube. In smaller boilers, the additional power generation tubes are separated in the furnace, while larger utility boilers rely on water injection tubes that make up the furnace wall to generate steam. High-pressure water tube boiler: The hot water then rises into the steam drum. Here, saturated steam is drawn away from the top of the drum

Process flowchart

Chemical & Mechanical properties of available steel grades

Checial composition

Standard	Steel Grade	C	Si	Mn	S	P	Cr	Mo	V	Ti	B	W	Ni	Al	Nb	N	Others
GB 3087	10	0.07-0.13	0.17-0.37	0.35-0.65	0.020	0.025	≤0.15
	20	0.17-0.23	0.17-0.37	0.35-0.65	0.020	0.025	≤0.25
DIN 17175	St 35.8	≤0.17	0.10-0.35	0.40-0.80	0.020	0.025
	St 45.8	≤0.21	0.10-0.35	0.40-1.20	0.020	0.025
	15Mo3	0.12-0.20	0.10-0.35	0.40-0.80	0.020	0.025		0.25-0.35
	13CrMo44	0.10-0.18	0.10-0.35	0.40-0.70	0.020	0.025	0.70-1.10	0.45-0.65
	10CrMo910	0.08-0.15	≤0.50	0.40-0.70	0.020	0.025	2.00-2.50	0.90-1.20
	14MoV63	0.10-0.18	0.10-0.35	0.40-0.70	0.020	0.025	0.30-0.60	0.50-0.70	0.22-0.32
	12Cr1MoV	0.08-0.15	0.17-0.37	0.40-0.70	0.020	0.025	0.90-1.20	0.25-0.35	0.15-0.30
GB5310	20G	0.17-0.23	0.17-0.37	0.35-0.65	0.015	0.025
	20 MnG	0.17-0.24	0.17-0.37	0.70-1.00	0.015	0.025
	25 MnG	0.22-0.27	0.17-0.37	0.70-1.00	0.015	0.025
	15 MoG	0.12-0.20	0.17-0.37	0.40-0.80	0.015	0.025		0.25-0.35
	20 MoG	0.15-0.25	0.17-0.37	0.40-0.80	0.015	0.025		0.44-0.65
	12CrMoG	0.08-0.15	0.17-0.37	0.40-0.70	0.015	0.025	0.40-0.70	0.40-0.55
	15CrMoG	0.12-0.18	0.17-0.37	0.40-0.70	0.015	0.025	0.80-1.10	0.40-0.55
	12Cr2MoG	0.08-0.15	≤0.60	0.40-0.60	0.015	0.025	2.00-2.50	0.90-1.13
	12Cr1MoVG	0.08-0.15	0.17-0.37	0.40-0.70	0.010	0.025	0.90-1.20	0.25-0.35	0.15-0.30
	12Cr2MoWVTiB	0.08-0.15	0.45-0.75	0.45-0.65	0.015	0.025	1.60-2.10	0.50-0.65	0.28-0.42	0.08-0.18	0.002-0.008	0.30-0.55
	10Cr9Mo1VNbN	0.08-0.12	0.20-0.50	0.30-0.60	0.010	0.020	8.00-9.50	0.85-1.05	0.18-0.25				≤0.040	≤0.040	0.06-0.10	0.03-0.07
	07Cr19Ni10	0.04-0.10	≤0.75	≤2.0	0.015	0.035	17.00-20.00		8.00-11.00
	07Cr18Ni11Nb	0.04-0.10	≤0.75	≤2.0	0.150	0.030	17.00-19.00						9.00-13.00	8C-1.10
ASTMA 106 ASME SA-106M	A 106B SA-106B	≤0.30	≥0.10	0.29-1.06	0.020	0.025
	A 106C SA-106C	≤0.35	≥0.10	0.29-1.06	0.020	0.025
ASTM A192 ASME SA-192M	SA 192 SA-192	0.06-0.18	≤0.25	0.27-0.63	0.020	0.025
ASTM A209 ASME SA-209M	A209T1 SA-209T1	0.10-0.20	0.10-0.50	0.30-0.80	0.020	0.025		0.44-0.65
	A209T1b SA-209T1b	≤0.14	0.10-0.50	0.30-0.80	0.020	0.025		0.44-0.65
	A209T1a SA-209T1a	0.15-0.25	0.10-0.50	0.30-0.80	0.020	0.025		0.44-0.65
ASTM A210 ASME SA-210M	A 210A1 SA-210A1	≤0.27	≥0.10	≤0.93	0.020	0.025
	A 210C SA-210C	≤0.35	≥0.10	0.29-1.06	0.020	0.025
ASTM A213 ASME SA-213M	A 213 T2 SA-213 T2	0.10-0.20	0.10-0.30	0.30-0.61	0.020	0.025	0.50-1.81	0.44-0.65
	A 213 T11 SA-213 T11	0.05-0.15	0.50-1.00	0.30-0.60	0.020	0.025	1.00-1.50	0.44-0.65
	A 213 T12 SA-213 T12	≤0.15	≤0.50	0.30-0.61	0.020	0.025	0.80-1.25	0.44-0.65
	A 213 T22 SA-213 T22	0.05-0.15	≤0.50	0.30-0.60	0.020	0.025	1.90-2.60	0.87-1.13
	A 213 T23 SA-213 T23	0.04-0.10	≤0.50	0.10-0.60	0.010	0.025	1.90-2.60	0.05-0.30	0.20-0.30	0.005-0.06	0.0005-0.006	1.45-1.75		≤0.03	0.02-0.08	≤0.03	Ti/N≥3.5
	A 213 T24 SA-213 T24	0.05-0.10	0.15-0.45	0.30-0.70	0.020	0.025	2.20-2.60	0.70-1.10	0.20-0.30	0.06-0.10	0.0015-0.0020			≤0.02		≤0.012
	A 213 T91 SA-213 T91	0.08-0.12	0.20-0.50	0.30-0.60	0.010	0.020	8.00-9.50	0.85-1.05	0.18-0.25				≤0.40	≤0.40	0.06-0.10	0.03-0.07
	A 213 T911 SA-213 T911	0.09-0.13	0.10-0.50	0.30-0.60	0.020	0.025	8.50-10.50	0.90-1.10	0.18-0.25		0.0003-0.006	0.90-1.10	≤0.40	≤0.40	0.06-0.10	0.04-0.09
	A 213 T92 SA-213 T92	0.07-0.13	≤0.5	0.3-0.6	0.010	0.020	8.50-9.50	0.30-0.60	0.15-0.25		0.001-0.006	1.50-2.00	≤0.4	≤0.4	0.04-0.09	0.03-0.07
	A 213 T122 SA-213 T122	0.07-0.14	≤0.5	≤0.70	0.010	0.020	10.00-12.50	0.25-0.60	0.15-0.30		0.0005-0.005	1.50-2.50	≤0.5	≤0.4	0.040-0.10	0.040-0.100
	TP304H	0.04-0.10	≤0.75	≤2.0	0.030	0.040	18.00-20.00						8.00-11.000
	TP321H	0.04-0.10	≤0.75	≤2.0	0.030	0.040	17.00-20.00			4*C%-0.60			9.00-13.00
	TP347H	0.04-0.10	≤0.75	≤2.0	0.030	0.040	17.00-20.00						9.00-13.00				Nb+Ta≥8*C%-1.00
	S30432	0.07-0.13	≤0.30	≤1.0	0.040	0.010	17.00-20.00				0.001-0.010		7.5-10.5	0.003-0.030	0.30-0.60	0.05-0.12	Cu 2.50-3.50
	TP310HCbN	0.04-0.10	≤0.75	≤2.0	0.030	0.030	24.00-26.00						17.0-23.0		0.20-0.60	0.15-0.35
EN10216-2	P195GH	≤0.13	≤0.35	≤0.70	0.020	0.025	≤0.30	≤0.08	≤0.02	≤0.040			≤0.30	≥0.02	≤0.01		Cr+Cu+Mo+Ni≤ 0.70
	P235GH	≤0.16	≤0.35	≤1.20	0.020	0.025	≤0.30	≤0.08	≤0.02	≤0.040			≤0.30	≥0.02	≤0.01		Cr+Cu+Mo+Ni≤ 0.70
	P265GH	≤0.20	≤0.40	≤1.40	0.020	0.025	≤0.30	≤0.08	≤0.02	≤0.040			≤0.30	≥0.02	≤0.01		Cr+Cu+Mo+Ni≤ 0.70
	16Mo3	0.12-0.20	≤0.35	0.40-0.90	0.020	0.025	≤0.30	0.25-0.35					≤0.30	≤0.04			Cu≤ 0.30
	10CrMo5-5	≤0.15	0.50-1.00	0.30-0.60	0.020	0.025	1.00-1.50	0.45-0.65					≤0.30	≤0.04			Cu≤ 0.30
	13CrMo4-5	0.10-0.70	≤0.35	0.40-0.70	0.020	0.025	0.70-1.15	0.40-0.60					≤0.30	≤0.04			Cu≤ 0.30
	10CrMo9-10	0.08-0.14	≤0.50	0.30-0.70	0.020	0.025	2.00-2.50	0.90-1.10					≤0.30	≤0.04			Cu≤ 0.30
	X10CrMoVNb9-1	0.08-0.12	0.20-0.50	0.30-0.60	0.010	0.020	8.00-9.50	0.85-1.05	0.18-0.25				≤0.40	≤0.04	0.06-0.10	0.03-0.07	Cu≤ 0.30
JIS G3461	STB 340	≤0.18	≤0.35	0.30-0.60	0.020	0.025
	STB 410	≤0.32	≤0.35	0.30-0.80	0.020	0.025
	STB 510	≤0.25	≤0.35	1.00-1.50	0.020	0.025
JIS G3462	STAB 12	0.10-0.20	0.10-0.50	0.30-0.80	0.020	0.025		0.45-0.65
	STAB 13	0.15-0.25	0.10-0.50	0.30-0.80	0.020	0.025		0.45-0.65
	STAB 20	0.10-0.20	0.10-0.50	0.30-0.80	0.020	0.025		0.45-0.65
	STAB 22	≤0.15	≤0.50	0.30-0.60	0.020	0.025	0.80-1.25	0.45-0.65
	STAB 23	≤0.15	0.50-1.00	0.30-0.60	0.020	0.025	1.00-1.25	0.45-0.65
	STAB 24	≤0.15	≤0.50	0.30-0.60	0.020	0.025	1.90-2.60	0.87-1.13
	STAB 26	≤0.15	0.25-1.00	0.30-0.60	0.020	0.025	8.00-10.0	0.90-1.10
JIS G3463	SUS304HTB	0.04-0.10	≤2.00	≤0.75	0.020	0.025	18.00-20.00						8.00-11.000
	SUS321HTB	0.04-0.10	≤2.00	≤0.75	0.020	0.025	17.00-20.00			4*C%-0.60			9.00-13.00
GB 13296	0Cr18Ni9	0.07	≤1.00	≤2.00	0.030	0.035	17.00-19.00						8.00-11.00
	1Cr18Ni9	≤0.15	≤1.00	≤2.00	0.030	0.035	17.00-19.00						8.00-11.00
	00Cr19Ni10	≤0.03	≤1.00	≤2.00	0.030	0.035	18.00-20.00						8.00-12.00
	2Cr23Ni13	≤0.20	≤1.00	≤2.00	0.030	0.035	22.00-24.00						12.00-15.00
	0Cr23Ni13	≤0.08	≤1.00	≤2.00	0.030	0.035	22.00-24.00						12.00-15.00
	2Cr25Ni20	≤0.25	≤1.00	≤2.00	0.030	0.035	22.00-24.00						19.00-22.00
	0Cr25Ni20	≤0.08	≤1.00	≤2.00	0.030	0.035	24.00-26.00						19.00-22.00
	0Cr17Ni12Mo2	≤0.08	≤1.00	≤2.00	0.030	0.035	16.00-18.50	2.00-3.00					10.00-14.00
	1Cr17Ni12Mo2	0.04-0.1	≤0.75	≤2.00	0.030	0.035	16.00-18.00	2.00-3.00					11.00-14.00
	00Cr17Ni14Mo2	≤0.03	≤1.00	≤2.00	0.030	0.035	16.00-18.00	2.00-3.00					12.00-15.00
	0Cr19Ni13Mo3	≤0.08	≤1.00	≤2.00	0.030	0.035	18.00-20.00	3.00-4.00					11.00-15.00
	00Cr19Ni13Mo3	≤0.03	≤1.00	≤2.00	0.030	0.035	18.00-20.00	3.00-4.00					11.00-15.00
	1Cr18Ni9Ti	0.04-0.1	≤1.00	≤2.00	0.030	0.035	17.00-19.00			5*(C-0.02)-0.80			8.00-11.00
	0Cr18Ni10Ti	≤0.08	≤1.00	≤2.00	0.030	0.035	17.00-19.00			≥5*C			9.00-12.00
	1Cr18Ni11Ti	0.04-0.1	≤1.00	≤2.00	0.030	0.035	17.00-20.00			4*C-0.60			9.00-13.00
	0Cr18Ni11Nb	≤0.08	≤1.00	≤2.00	0.030	0.035	17.00-19.00						9.00-13.00
	1Cr19Ni11Nb	0.04-0.1	≤1.00	≤2.00	0.030	0.035	17.00-20.00						9.00-13.00
	0Cr18ni13Si4	≤0.08	≤1.00	≤2.00	0.030	0.035	15.00-20.00						11.00-15.00
	0Cr18Ni12Mo2Ti	≤0.08	≤1.00	≤2.00	0.030	0.035	16.00-19.00	1.80-2.50		5*C-0.70			11.00-14.00
	1Cr18Ni12Mo2Ti	≤0.12	≤1.00	≤2.00	0.030	0.035	16.00-19.00	1.80-2.50		5*(C-0.02)-0.80			11.00-14.00
	1Cr18Ni12Mo3Ti	≤0.12	≤1.00	≤2.00	0.030	0.035	16.00-19.00	2.50-3.50		5*(C-0.02)-0.80			11.00-14.00
	0Cr18Ni12Mo3Ti	≤0.08	≤1.00	≤2.00	0.030	0.035	16.00-19.00	2.50-3.50		5*C-0.70			11.00-14.00

Note: Grades other than the a.m. chart can be made available through consultations.

Mechanical properties

Standard	Grade	Tensile strength (Mpa)	Yield point(Mpa) not less than	Elongation(%) not less than	Impact(J) not less than	Hardness not less than
GB 3087	10	335-475	205(T<16mm） 195(t≥16mm)	24	"	"
	20	392-588	245(T<16mm） 235(t≥16mm)	20	"	"
DIN 17175	St35.8	360-480	235(T<16mm） 225(t≥16mm)	25	"	"
	St45.8	410-530	255(T<16mm） 245(t≥16mm)	21	"	"
	15Mo3	456-600	270	22	"	"
	13CrMo44	440-590	290	22	"	"
	10CrMo910	450-600	280	20	"	"
	14MoV63	460-610	320	20	55	"
	12Cr1MoV	470-640	255	21	41	"
GB 5310	20G	410-550	245	24/22	40/27	"
	25MnG	485-640	275	20/18	40/27	"
	15MoG	450-600	270	22/20	40/27	"
	20MoG	415-665	220	22/20	40/27	"
	12CrMoG	410-560	205	21/19	40/27	"
	12 Cr2MoG	450-600	280	22/20	40/27	"
	12 Cr1MoVG	470-640	255	21/19	40/27	"
	12Cr2MoWVTiB	540-735	345	18	40/27	"
	10Cr9Mo1VNb	≥585	415	20	40	"
	1Cr18Ni9	≥520	206	35		"
	1Cr19Ni11Nb	≥520	206	35		"
ASTM A106 ASME SA-106M	A106B/SA-106B	≥415	240	30	"	"
	A 106C/SA-106C	≥485	275	30	"
ASTM A192 ASME SA-192M	A192/SA-192	≥325	180	35	"	77HRB
ASTM A209 ASME SA-209M	A 209T1/SA-209 T1	≥380	205		"	80HRB
	A 209T1b/SA-209T1b	≥365	195		"	77HRB
	A209T1a/SA-209T1a	≥415	220		"	81HRB
ASTM A210 ASME SA-210M	A210 A1/ SA-210A1	≥415	255		"	79HRB
	A210C/ SA-210C	≥485	275		"	89HRB
ASTM A213 ASME SA-213M	A213 T2/SA213 T2	≥415	205		"	85HRB
	A213 T11/SA213 T11	≥415	205		"	85HRB
	A213 T22/SA213 T22	≥415	205		"	85HRB
	A213 T23/SA213 T23	≥510	400	20	"	97HRB
	A213 T24/SA213 T24	≥585	415	20	"	25HRB
	A213 T91/SA213 T91	≥585	415	20	"	25HRB
	A213 T911/SA213 T911	≥620	440	20	"	25HRB
	A213 T22/SA213 T92	≥620	440	20	"	25HRB
	A213 T122/SA213 T122	≥620	400	20		25HRB
	TP304H	≥515	205	35		90HRB
	TP316H	≥515	205	35		90HRB
	TP321H	≥515	205	35		90HRB
	TP347H	≥515	205	35		90HRB
	S30432	≥590	235	35		95HRB
	TP310HCbN	≥655	295	30		100HRB
EN 10216-2	P195GH	320-440	195	27
	P235GH	360-500	235	25
	P265GH	410-570	265	23
	16Mo3	450-600	280	22
	10CrMo5-5	410-560	275	22
	13CrMo4-5	440-590	290	22
	10CrMo9-10	480-630	280	22
	X10CrMoVBb9-1	630-830	450	19	41
JIS G 3461	STB 340	≥340	175	35
	STB 410	≥410	255	25
	STB 510	≥510	295	25
JIS G 3462	STBA 12	≥382	175	35
	STBA 13	≥412	255	25
	STBA 20	≥412	295	25
	STBA 22	≥412	206
	STBA 23	≥412	206
	STBA 24	≥412	206
	STBA 26	≥412	206
	STBA 19	≥412	206
JIS G 3463	SUS 304HTB	≥520	206
	SUS 316HTB	≥520	206
	SUS 321HTB	≥520	206
	SUS 347HIB	≥520	206
GB 13296	0Cr18Ni9	≥520	205	35
	1Cr18Ni9	≥520	205	35
	00Cr19Ni10	≥480	175	35
	2Cr23Ni13	≥520	205	35
	0Cr23Ni13	≥520	205	35
	2Cr25Ni20	≥520	205	35
	0Cr25Ni20	≥520	205	35
	0Cr17Ni12Mo2	≥520	205	35
	1Cr17Ni12Mo2	≥520	205	35
	00Cr17Ni14Mo2	≥480	175	40
	0Cr19Ni13Mo3	≥520	205	35
	00Cr19Ni13Mo3	≥480	175	35
	1Cr18Ni9Ti	≥520	205	40
	0Cr18Ni10Ti	≥520	205	35
	1Cr18Ni11Ti	≥520	205	35
	0Cr18Ni11Nb	≥520	205	35
	1Cr19Ni11Nb	≥520	205	35
	0Cr18ni13Si4	≥520	205	35
	0Cr18Ni12Mo2Ti	≥530	205	35
	1Cr18Ni12Mo2Ti	≥540	215	35
	1Cr18Ni12Mo3Ti	≥530	205	35
	0Cr18Ni12Mo3Ti	≥540	215	35

 

Facilities & Services

Beveling & Cutting

SunnySteel can provide OD beveling and cut your boiler tubes to any length.

The length of the pipe cut according to the requirement. Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.

Steel pipe hydrostatic testing

For hydrostatic testing purposes, there are two: one is the process of hydraulic test to test whether the leaking pipe, that test tube sealing performance;

Another is confirmatory hydrostatic test to test the strength of steel adequacy. In general, low and medium pressure boiler pipe hydrostatic test is part of the process of the hydrostatic test, which is the density of material testing and inspect and whether the material is a continuous dense; it is not verify the strength tests. From the intensity of mechanics of materials theory, seamless steel components are thin and long, and its diameter is very small, even for thin-walled capillary tubes can withstand great pressure. That is to say, when low and medium pressure boiler tubes test pressure, even when there are deep cracks, can not happen leaking.

Hydrostatic test is that many product specification test methods are available. This test can detect leakage of liquid from the inner wall of the case outward can be observed with the naked eye or with a pressure drop to determine. Hydrostatic test can not be found through-wall defects but very close or very close to the wall thickness in depth but not yet fully penetrated defects. Conducted for each pipe eddy current inspection after the low and medium pressure boiler pipe hydrostatic testing is not necessary to replace the hydrostatic test eddy current testing.

Steel pipe hydrostatic testing procedure is as follows:

• test section at the end of block, slow water injection, the tube gas discharge.
• after the steel tube filled with water, water tightness checks.
• made slow progress in steel pressure appropriate USES manual pump, booster time should not less than 10 min.
• stop pressure after test pressure, observe the 10 min, must not exceed 0.02 MPa pressure drop; Then put the testing pressure drop to the working pressure, steel pipe for visual inspection, leak-proof is not qualified.
• after arrival, steel pipe pressure, leakage and pressure drop more than a specified value, check the steel tube, after the reason to discharge the leakage, as stipulated in the above to test again, until it meets the requirements.
• the temperature is lower than 5 ℃ under the environment of water pressure and water capacity, reliable antifreezing measures should be taken, after the test, water should be put.

Special Packaging

SunnySteel can supply wood blocking, crating, capping and wrapped ends.