HOT DIP GALVANIZED STEEL – HDG STEEL

– Advantages:

+ HDG steel pipe is coated by zinc finish. Zinc plating can increase the corrosion resistance of steel pipes and prolong their service life.

+ Manufactures create galvanized steel by immersing the steel pipes in a tank of molten zinc called “hot dip galvanizing” at high temperatures.

– Applications:

+ Construction, machinery, coal, chemical, eletric power, railway vehicles, automobile industry, roads, bridges, containers, sports facilities.

+ Widely used in pipelines for general low-pressure fluids such as water, gas, oil. etc., and also used á oil well pipes and oil pipes in the petroleum industry.

Vina One not only manufactures the products as our standard commercial specifications, but also make to customer’s orders.

PRODUCTION PROCESS

INDENTIFYING SIGNES

AS 1074

MANUFACTURING DIMENSIONS

Nominal size	Designation of thread	XL			L			M			H
Nominal size	Designation of thread	Outside diameter (mm)	Thickness (mm)	Weight (kg/m)	Outside diameter (mm)	Thickness (mm)	Weight (kg/m)	Outside diameter (mm)	Thickness (mm)	Weight (kg/m)	Outside diameter (mm)	Thickness (mm)	Weight (kg/m)
DN15	1/2	21.2	1.9	0.904	21.2	2	0.947	21.4	2.6	1.21	21.4	3.2	1.44
DN20	3/4	26.7	2.1	1.27	26.7	2.3	1.38	26.9	2.6	1.56	26.9	3.2	1.87
DN25	1	33.5	2.3	1.77	33.5	2.6	1.98	33.8	3.2	2.41	33.8	4.0	2.94
DN32	1 1/4	42.2	2.3	2.26	42.2	2.6	2.54	42.5	3.2	3.1	42.5	4.0	3.8
DN40	1 1/2	48.1	2.5	2.81	48.1	2.9	3.23	48.4	3.2	3.57	48.4	4.0	4.38
DN50	2	59.9	2.6	3.67	59.9	2.9	4.08	60.3	3.6	5.03	60.3	4.5	6.19
DN65	2 1/2	75.6	2.9	5.2	75.6	3.2	5.71	76	3.6	6.43	76	4.5	7.93
DN80	3	88.3	2.9	6.11	88.3	3.2	6.72	88.8	4	8.37	88.8	5.0	10.3
DN125	4	1135	3.2	8.7	113.5	3.6	9.75	114.1	4.5	12.2	114.1	5.4	14.5
DN150	5	–	–	–	–	–	–	139.7	5	16.6	139.7	5.4	17.9

ASTM A53-53M

Nominal Designator	NPS Designator	Outside diameter		Wall thickness		Nominal weight		Weight class	Schedule No.	Grade A		Grade B
Nominal Designator	NPS Designator	in	mm	in	mm	lb/ft	kg/m	Weight class	Schedule No.	psi	kPa	psi	kPa
15	1/2	0.84	21.3	0.109	2.77	0.86	1.27	STD	40	700	4800	700	4800
15	1/2	0.84	21.3	0.147	3.73	1.09	1.62	XS	80	850	5900	850	5900
20	3/4	1.05	26.7	0.113	2.87	1.14	1.69	STD	40	700	4800	700	4800
20	3/4	1.05	26.7	0.154	3.91	1.47	2.2	XS	80	850	5900	850	5900
25	1	1.315	33.4	0.133	3.38	1.67	2.5	STD	40	700	4800	700	4800
25	1	1.315	33.4	0.179	4.55	2.18	3.24	XS	80	850	5900	850	5900
32	11/4	1.66	42.2	0.14	3.56	2.27	3.39	STD	40	1200	8300	1300	9000
32	11/4	1.66	42.2	0.191	4.85	2.99	4.47	XS	80	1800	12400	1900	13100
40	11/2	1.9	48.3	0.145	3.68	2.71	4.05	STD	40	1200	8300	1300	9000
40	11/2	1.9	48.3	0.2	5.08	3.63	5.41	XS	80	1800	12400	1900	13100
50	2	2.375	60.3	0.154	3.91	3.65	5.44	STD	40	2300	15900	2500	17200
50	2	2.375	60.3	0.218	5.54	5.02	7.48	XS	80	2500	17200	2500	17200
65	21/2	2.875	73	0.203	5.16	5.79	8.63	STD	40	2500	17200	2500	17200
65	21/2	2.875	73	0.276	7.01	7.66	11.41	XS	80	2500	17200	2500	17200
80	3	3.5	88.9	0.125	3.18	4.51	6.72	–	–	1290	8900	1500	1000
				0.156	3.96	5.57	8.29	–	–	1600	11000	1870	12900
				0.188	4.78	6.64	9.92	–	–	1930	13330	2260	15600
				0.216	5.49	7.57	11.29	STD	40	2220	15300	2500	17200
				0.25	6.35	8.67	12.93	–	–	2500	17200	2500	17200
				0.281	7.14	9.66	14.4	–	–	2500	17200	2500	17200
100	4	4.5	114.3	0.125	3.18	5.81	8.71	–	–	1000	6900	1170	8100
				0.156	3.96	7.14	10.78	–	–	1250	8600	1460	10100
				0.188	4.78	8.56	12.91	–	–	1500	10300	1750	12100
				0.219	5.56	9.99	14.91	–	–	1750	12100	2040	14100
				0.237	6.02	10.78	16.07	–	40	1900	13100	2210	15200
125	5	5.563	141.3	0.156	3.96	9	13.41	–	–	1010	7000	1180	8100
				0.188	4.78	10.78	16.09	–	–	1200	8400	1420	9800
				0.219	5.56	12.47	18.61	–	–	1420	9800	1650	11400
				0.258	6.55	14.61	21.77	STD	40	1670	1150	1950	13400
				0.281	7.14	15.84	23.62	–	–	1820	12500	2120	14600
				0.312	7.92	17.47	26.05	–	–	2020	13900	2360	16300
				0.344	8.74	19.16	28.57	–	–	2230	15400	2600	17900
				0.375	9.52	20.75	30.94	XS	80	2430	16800	2800	19300
150	6	6.625	168.3	0.188	4.78	12.94	19.27	–	–	1020	7000	1190	8200
				0.219	5.56	14.96	22.31	–	–	1190	8200	1390	9600
				0.25	6.35	17.01	25.36	STD	40	1360	9400	1580	10900
				0.28	7.11	18.94	28.26	–	–	1520	10500	1780	12300
				0.312	7.92	21.01	31.32	–	–	1700	11700	1980	13700
				0.344	8.74	23.06	34.39	–	–	1870	12900	2180	15000
				0.375	9.52	24.99	37.28	–	–	2040	14100	2380	16400
				0.432	10.97	28.53	42.56	–	–	2350	16200	2740	18900
200	8	8.625	219.1	0.188	4.78	16.94	25.26	–	–	780	5400	920	6300
				0.203	5.16	18.26	27.22	–	–	850	5900	1000	6900
				0.219	5.56	19.62	29.28	–	–	910	6300	1070	7400
				0.250	6.35	22.33	33.31	–	20	1040	7200	1220	8400
				0.277	7.04	24.68	36.81	–	30	1160	7800	1350	9300
				0.312	7.92	27.65	41.24	–	–	1300	9000	1520	10500
				0.322	8.18	28.53	42.55	STD	40	1340	9200	1570	10800
				0.344	8.74	30.4	45.34	–	–	1440	9900	1680	11600
				0.375	9.52	33	49.2	–	–	1570	10800	1830	12600
				0.406	10.97	35.6	53.08	–	60	1700	11700	2000	13800

BS 1387

Nominal size (DN)	Desig nation of thread	XL			L			M			H
Nominal size (DN)	Desig nation of thread	Outside diameter (mm)	Thick ness (mm)	Weight (kg/m)	Outside diameter Max – Min (mm)	Thick ness (mm)	Weight (kg/m)	Outside diameter Max – Min (mm)	Thick ness (mm)	Weight (kg/m)	Outside diameter Max – Min (mm)	Thick ness (mm)	Weight (kg/m)
DN15	1/2	21.2	1.9	0.904	21.2	2	0.947	21.4	2.6	1.21	21.4	3.2	1.44
DN20	3/4	26.7	2.1	1.27	26.7	2.3	1.38	26.9	2.6	1.56	26.9	3.2	1.87
DN25	1	33.5	2.3	1.77	33.5	2.6	1.98	33.8	3.2	2.41	33.8	4.0	2.94
DN32	1 1/4	42.2	2.3	2.26	42.2	2.6	2.54	42.5	3.2	3.1	42.5	4.0	3.8
DN40	1 1/2	48.1	2.5	2.81	48.1	2.9	3.23	48.4	3.2	3.57	48.4	4.0	4.38
DN50	2	59.9	2.6	3.67	59.9	2.9	4.08	60.3	3.6	5.03	60.3	4.5	6.19
DN65	2 1/2	75.6	2.9	5.2	75.6	3.2	5.71	76	3.6	6.43	76	4.5	7.93
DN80	3	88.3	2.9	6.11	88.3	3.2	6.72	88.8	4	8.37	88.8	5.0	10.3
DN100	4	113.5	3.2	8.7	113.5	3.6	9.75	114.1	4.5	12.2	114.1	5.4	14.5
DN125	5	–	–	–	–	–	–	139.7	5	16.6	139.7	5.4	17.9
DN150	6	–	–	–	–	–	–	165.1	5	19.7	165.1	5 1	21.3

ASTM A795

L
DIMENSIONS – WEIGHTS									TESTING PRESSURE
DIMENSIONS – WEIGHTS									TESTING PRESSURE
NPS Designator	Nominal Designator	Outside Diamerer		Wall Thickness		Nominal Weight		Schedule No.	psi	kPa
NPS Designator	Nominal Designator	in	mm	in	mm	lb/ft	kg/m	Schedule No.	psi	kPa
3/4	20	1.050	26.7	0.083	2.11	0.86	1.28	10	700	4800
1	25	1.315	33.4	0.109	2.77	1.41	2.09	10	700	4800
1¼	32	1.660	42.2	0.109	2.77	1.81	2.69	10	1000	6900
1½	40	1.900	48.3	0.109	2.77	2.09	3.11	10	1000	6900
2	50	2.375	60.3	0.109	2.77	2.64	3.93	10	1000	6900
2½	65	2.875	73.0	0.120	3.05	3.53	5.26	10	1000	6900
3	80	3.500	88.9	0.120	3.05	4.34	6.46	10	1000	6900
3½	90	4.000	101.6	0.120	3.05	4.98	7.41	10	1200	8300
4	100	4.500	114.3	0.120	3.05	5.62	8.37	10	1200	8300
5	125	5.563	141.3	0.134	3.40	7.78	11.58	10	1200	8300
6	150	6.625	168.3	0.134	3.40	9.3	13.85	10	1000	6900
8	200	8.625	219.1	0.188	4.78	16.96	25.26	–	800	5500
STANDARD
DIMENSIONS – WEIGHTS									TESTING PRESSURE
DIMENSIONS – WEIGHTS									TESTING PRESSURE
NPS Designator	Nominal Designator	Outside Diamerer		Wall Thickness		Nominal Weight		Schedule No.	psi	kPa
NPS Designator	Nominal Designator	in	mm	in	mm	lb/ft	kg/m	Schedule No.	psi	kPa
1/4	15	0.840	21.3	0.109	2.77	0.85	1.27	40	700	4800
3/4	20	1.050	26.7	0.113	2.87	1.13	1.69	40	700	4800
1	25	1.315	33.4	1.68	3.38	1.68	2.50	40	700	4800
1¼	32	1.660	42.2	2.27	3.56	2.27	3.39	40	1000	6900
1½	40	1.900	48.3	2.72	3.68	2.72	4.05	40	1000	6900
2	50	2.375	60.3	3.66	3.91	3.66	5.45	40	1000	6900
2½	65	2.875	73.0	5.80	5.16	5.80	8.64	40	1000	6900
3	80	3.500	88.9	7.58	5.49	7.58	11.29	40	1000	6900
3½	90	4.000	101.6	9.12	5.74	9.12	13.58	40	1200	8300
4	100	4.500	114.3	10.80	6.02	10.80	16.09	40	1200	8300
5	125	5.563	141.3	14.63	6.55	14.63	21.79	40	1200	8300
6	150	6.625	168.3	18.99	7.11	18.99	28.29	40	1200	8300
8	200	8.625	219.1	24.72	7.04	24.72	36.82	30	1200	8300

TOLERANCE ALLOWANCES

MECHANICAL & CHEMICAL PROPERTIES

Outside Diameter Tolerance (mm)

≦DN40: ± 0.4mm

Grade

≧DN50:
± 1%

Thickness Tolerance

– 12.5%
+ no specified

Grade A

0.25

Max

–

0.95

Max

0.035

Max

Length Tolerance

– 0
+ no specified

Grade B

0.30

Max

–

1.20

Max

0.035

Max

Weight Tolerance

± 10%

BS EN 10255

Nominal size (DN)	Desig nation of thread	Outside diameter (mm)	H			M			L
Nominal size (DN)	Desig nation of thread	Outside diameter (mm)	Outside diameter Min – Max (mm)	Thickness (mm)	Weight (kg/m)	Outside diameter Min – Max (mm)	Thickness (mm)	Weight (kg/m)	Outside diameter Min – Max (mm)	Thickness (mm)	Weight (kg/m)
DN15	1/2	21.3	–	–	–	21.0 – 21.8	2.60	1.21	21.0 – 21.7	2.30	1.08
DN20	3/4	26.9	–	–	–	26.5 – 27.5	2.60	1.56	26.4 – 27.1	2.30	1.40
DN25	1	33.7	33.3 – 34.2	4.00	2.93	33.3 – 34.2	3.20	2.41	33.2 – 34.0	2.90	2.20
DN32	1 1/4	42.4	42.0 – 42.9	4.00	3.79	42.0 – 42.9	3.20	3.10	41.9 – 42.7	2.90	3.25
DN40	1 1/2	48.3	47.9 – 48.8	4.00	4.37	47.9 – 48.8	3.20	3.56	47.8 – 48.6	3.2	3.57
DN50	2	60.3	59.7 – 60.8	4.50	6.19	59.7 – 60.8	3.60	5.03	59.6 – 60.7	3.20	4.51
DN65	2 1/2	76.1	75.3 – 76.6	4.50	7.93	75.3 – 76.6	3.60	6.42	75.2 – 76.0	3.20	5.75
DN80	3	88.9	88.0 – 89.5	5.00	10.30	88.0 – 89.5	4.00	8.36	87.9 – 88.7	3.20	6.76
DN90	3 1/2	101.6	–	–	–	–	–	–	100.3 – 101.2	3.60	8.70
DN100	4	114.3	113.1 – 115.0	5.40	14.50	113.1 – 115.0	4.50	12.20	113.0 – 113.9	3.60	9.83
DN125	5	139.7	138.5 – 140.8	5.40	17.90	138.5 – 140.8	5.00	16.60	138.5 – 140.8	4.50	15.00
DN150	6	165.1	163.9 – 166.5	5.40	21.30	163.9 – 166.5	5.00	19.80	163.9 – 166.5	4.50	17.80

Nominal size (DN)	Desig nation of thread	Outside diameter (mm)	L1			L2
Nominal size (DN)	Desig nation of thread	Outside diameter (mm)	Outside diameter Min – Max (mm)	Thick ness (mm)	Weight (kg/m)	Outside diameter Min – Max (mm)	Thick ness (mm)	Weight (kg/m)
DN15	1/2	21.3	21.0 – 21.7	2.30	1.08	21.0 – 21.4	2.00	0.947
DN20	3/4	26.9	26.4 – 27.1	2.30	1.39	26.4 – 26.9	2.30	1.38
DN25	1	33.7	33.2 – 34.0	2.90	2.20	33.2 – 33.8	2.60	2.54
DN32	1 1/4	42.4	41.9 – 42.7	2.90	2.82	41.9 – 42.5	2.60	2.54
DN40	1 1/2	48.3	47.8 – 48.6	2.90	3.24	47.8 – 48.4	2.90	3.23
DN50	2	60.3	59.6 – 60.7	3.20	4.49	59.6 – 60.2	2.90	4.08
DN65	2 1/2	76.1	75.2 – 76.3	3.20	5.73	75.2 – 76.0	3.20	5.71
DN80	3	88.9	87.9 – 89.4	3.60	7.55	87.9 – 88.7	3.20	6.72
DN90	3 1/2	101.6	–	–	–	–	–	–
DN100	4	114.3	113.0 – 114.9	4.00	10.80	113.0 – 113.9	3.20	9.75
DN125	5	139.7	–	–	–	–	–	–
DN150	6	165.1	–	–	–	–	–	–

DUNG SAI CHO PHÉP
Dung sai độ dày			± 10% cho Loại H, M, L ± 8% cho Loại L1, L2

Length tolerance	L ≤ 6m	-0 +10mm
	6m < L ≤ 12m	-0 +15mm
	L > 12m	-0 + no specified

Mass tolerance	± 7.5% on bundles of 10 tons or more for Type L, M, H
	+10%, -8% on individual tubes for Type L1, L2

Application
Used for water supply and drainage facilities in daily life, industry and agriculture. Fire protection system, pressure equipment system…..

TESTING CRITERIAS OF NON-CONFORMING TUBES
Grade	Chemical composition (%)					Mechanical properties
	C	Si	Mn	P	S	Upper yeild strength (Mpa)	Tensile strength (Mpa)	Elongation (%)

S 195T

0.20
Max

–

1.40
Max

0.035
Max

0.30
Max

195
Min

320 – 520

20
Min

TESTING CRITERIAS OF NON-CONFORMING TUBES

Flattening test
(applied to bare tubes with specified D > 60.3)

The weld inside			The weld outside
Shall be flattened in a press until reaches 75% of the original outside diameter of the tube with no cracks or flaws visible			Shall be flattened in a press until reaches 60% of the original outside diameter of the tube with no cracks or flaws visible

Bend test
(applied to bare tubes with specified D ≤ 60.3)

21.3

26.9

33.7

42.4

48.3

60.3

Bending radius

100

150

170

220

An angle of: 90 degrees
Welded tubes shall be bent with the weld at the outside of the bend.
Visual examination: There must be no cracks or burst welds.

Hydrostatic test (Water pressure test)

A hydrostatic test at a minimum of 50 bar for at least 5 seconds
Evaluation: With no evidence of leaks at the weld or pipe body.

HOT DIP GALVANIZED STEEL – HDG STEEL

contact