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UHS™ Structural Tubes
Ultra High strength, Seamless, Hot Rolled
Hollow Sections from ISMT
(conforming to EN 10210)

WIDEN YOUR POSSIBILITIES

Modern architectural projects make extensive use of seamless hot rolled, hollow sections. These structural elements as a result of their greater load bearing ability, lightness, availability in a wide range of wall thicknesses, and visual appeal, offer the architect unprecedented flexibility in design. The use of these tubes makes possible structures that are slender, light, aesthetically pleasing and yet very strong. If you are looking to create an iconic structure, UHS hollow sections offer numerous options. UHS hollow sections also find use in a variety of other structural applications such as the construction of off-shore derricks, agricultural machinery, crane booms, material handling systems, ships, and theme park rides. The special fine grain, high strength, quench and tempered UHS hollow sections described in this brochure are particularly well suited for such applications.

INHERENT STRENGTH

Unlike welded hollow sections, which are made by bending a steel strip and welding it longitudinally, a seamless hollow section is made from solid steel billet by piercing and elongating it. The absence of a weld, and the associated discontinuity in metal properties, ensures complete structural integrity of these hollow sections. Furthermore, since these sections are hot rolled and not cold formed as in the case of welded tubes, the material properties are completely uniform along the cross section. All our tubes conform to European Standards (EN 10210) for hotfinished structural hollow sections.

THE UHS ADVANTAGE ISMT UHS Structural Tubes Stockist UAE. ISMT UHS Structural Tubes Stockist Qatar, ISMT UHS Structural Tubes Stockist Kuwait, ISMT UHS Structural Tubes Stockist IRAN, ISMT UHS Structural Tubes Stockist Saudi Arab , ISMT UHS Structural Tubes Stockist Indonesia, ISMT UHS Structural Tubes Stockist Russia

Total metallurgical integrity
UHS hollow sections do not contain any weld and are hot formed. As a result, these have a fully normalized grain structure and uniform hardness along the cross section. Unlike their welded counterparts, these do not suffer from any weak spots, discontinuities in material properties, or residual stresses along the perimeter of the section.

High strength options
These sections are available in a wide range of steel grades including high strength grades that provide additional flexibility in design. These high strength grades include fine-grain steels and quench and tempered steels.

Wide range of wall thicknesses
Unlike welded structural hollows, which are restricted in wall thickness, UHS hollows are available in a very wide range of wall thicknesses - upto 40mm thick. This makes possible the design of structural elements with uniform external diameters under varying loads. For example, following this principle, the column diameter can be kept constant right through the height of the building.

Reduction in welding material and larger connecting areas
Hot rolled hollow sections have smaller corner radii, particularly when higher wall thickness tubes are involved. As a result, the welding material required reduces and the flat contact area increases.

Higher load carrying capability
As a result of the reduced corner radii mentioned above, hot rolled hollow sections have a greater sectional moment and can,therefore, carry higher loads.

Higher buckling loads ISMT UHS Structural Tubes Stockist UAE. ISMT UHS Structural Tubes Stockist Qatar, ISMT UHS Structural Tubes Stockist Kuwait, ISMT UHS Structural Tubes Stockist IRAN, ISMT UHS Structural Tubes Stockist Saudi Arab , ISMT UHS Structural Tubes Stockist Indonesia, ISMT UHS Structural Tubes Stockist Russia
Hot rolled seamless sections exhibit better buckling properties than their cold-formed welded counterparts. For this reason, Eurocode 3 norms allow higher buckling loads to be assigned to hot rolled sections.

Effective use of annular space
The empty space within the hollow section can be utilized effectively: UHS columns can be filled with concrete for added strength or with water for fire protection. Alternatively, this space can be used for conveying air-conditioning, electricity or water.

Smaller weld volumes
Weld volumes can be minimized by choosing smaller diameter sections with higher wall thicknesses.

APPLICATION

• Office buildings
• Industrial structures and bridge construction
• Sports complexes and stadiums
• Airport terminal
• Agricultural and farming equipments
• Frame structures and body work for locomotives
• Machine building
• Off-shore installations
• Ship building and material handling industry

MANFACTURING PROCESS

At ISMT, we believe the only way to guarantee quality is to stand responsible for the entire process. For this reason, the steel used for the manufacture of UHS hollow sections is produced in-house through the electric arc furnace route maintaining complete control of the entire production process. The raw material mix is chosen and prepared carefully to ensure the highest standards of cleanliness. All heats are fully killed, ladle refined and vacuum degassed before continuous casting into billets. These ultra-clean round steel billets form the starting point for the manufacture of UHS hollow sections. ISMT UHS Structural Tubes Stockist UAE. ISMT UHS Structural Tubes Stockist Qatar, ISMT UHS Structural Tubes Stockist Kuwait, ISMT UHS Structural Tubes Stockist IRAN, ISMT UHS Structural Tubes Stockist Saudi Arab , ISMT UHS Structural Tubes Stockist Indonesia, ISMT UHS Structural Tubes Stockist Russia

The round steel billets are ?rst heated to between 1,150 and 1,350º C in a rotary hearth furnace. After heating, these billets pass through a cross-roll piercing mill where a carefully positioned piercing point drives a hole through the solid billets to produce elongated rough hollow blooms. These hollow blooms are then rolled over a mandrel, either through a three roll Assel Mill or through a PQF Mill, and eventually through a stretch reducing mill, to produce accurately sized, hot rolled hollow sections.

Stringent process control continues right through the manufacturing and testing process so that we are able to consistently deliver UHS hollow sections with the exact qualities that are required.

NON-ALLOYED STRUCTURAL STEELS

Chemical analysis (%)

GRADE	C	Si	Mn	P	S	N
	Specified thickness( mm)
	≤ 40
S235JRH	≤ 0,17	-	≤1,40	≤ 0,040	≤ 0,040	≤ 0,009
S275J0H	≤ 0,20	-	≤1,50	≤ 0,035	≤ 0,035	≤ 0,009
S275J2H	≤ 0,20	-	≤1,50	≤ 0,030	≤ 0,030	-
S355J0H	≤ 0,22	≤ 0,55	≤1,60	≤ 0,035	≤ 0,035	≤ 0,009
S355J2H	≤ 0,22	≤ 0,55	≤1,60	≤ 0,030	≤ 0,030	-
S355K2H	≤ 0,22	≤ 0,55	≤1,60	≤ 0,030	≤ 0,030	-

Carbon Equivalents (cev) %

GRADE	Specified thickness mm
	≤ 16	>16 ≤ 40
S235JRH	≤ 0,37	≤ 0,39
S275J0H	≤ 0,41	≤ 0,43
S275J2H	≤ 0,41	≤ 0,43
S355J0H	≤ 0,45	≤ 0,47
S355J2H	≤ 0,45	≤ 0,47
S355K2H	≤ 0,45	≤ 0,47

ISMT UHS Structural Tubes Stockist UAE. ISMT UHS Structural Tubes Stockist Qatar, ISMT UHS Structural Tubes Stockist Kuwait, ISMT UHS Structural Tubes Stockist IRAN, ISMT UHS Structural Tubes Stockist Saudi Arab , ISMT UHS Structural Tubes Stockist Indonesia, ISMT UHS Structural Tubes Stockist Russia

Mechanical properties

GRADE	Min. Yield Strength (ReH) Mpa		Tensile Strength Rm) MPa		Elongation % Minimum		Min Impact Strength
	Specified thickness mm		Specified thickness mm		Specified thickness mm
					Long.	Transv.	T°C	J
	≤ 16	>16≤ 40	≤ 3	>3≤ 40	≤ 40	≤ 40
S235JRH	235	225	360-510	360-510	26	24	20	27
S275J0H	275	265	430-580	410-560	23	21	0	27
S275J2H	275	265	430-580	410-560	23	21	-20	27
S355J0H	355	345	510-680	470-630	22	20	0	27
S355J2H	355	345	510-680	470-630	22	20	-20	27
S355K2H	355	345	510-680	470-630	22	20	-20	40

FINE GRAIN STRUCTURAL STEELS

Chemical Analysis (%)

GRADE

Al tot.

S275NH

≤ 0.20

≤ 0.40

0.50-1.40

≤ 0.035

≤ 0.030

≤ 0.050

≤ 0.08

≥ 0.020

≤ 0.03

≤ 0.30

≤ 0.10

≤ 0.35

≤ 0.015

S275NLH

≤ 0.20

≤ 0.40

0.50-1.40

≤ 0.030

≤ 0.025

≤ 0.050

≤ 0.08

≥ 0.020

≤ 0.03

≤ 0.30

≤ 0.10

≤ 0.35

≤ 0.015

S355NH

≤ 0.20

≤ 0.50

0.50-1.40

≤ 0.035

≤ 0.030

≤ 0.050

≤ 0.12

≥ 0.020

≤ 0.03

≤ 0.30

≤ 0.50

≤ 0.10

≤ 0.35

≤ 0.020

S355NLH

≤ 0.18

≤ 0.50

0.50-1.40

≤ 0.030

≤ 0.025

≤ 0.050

≤ 0.12

≥ 0.020

≤ 0.03

≤ 0.30

≤ 0.50

≤ 0.10

≤ 0.35

≤ 0.020

S420NH

≤ 0.22

≤ 0.60

1.00-1.70

≤ 0.035

≤ 0.030

≤ 0.050

≤ 0.20

≥ 0.020

≤ 0.03

≤ 0.30

≤ 0.80

≤ 0.10

≤ 0.70

≤ 0.025

S420NLH

≤ 0.22

≤ 0.60

1.00-1.70

≤ 0.030

≤ 0.025

≤ 0.050

≤ 0.20

≥ 0.020

≤ 0.03

≤ 0.30

≤ 0.80

≤ 0.10

≤ 0.70

≤ 0.025

S460NH

≤ 0.22

≤ 0.60

1.00-1.70

≤ 0.035

≤ 0.030

≤ 0.050

≤ 0.20

≥ 0.020

≤ 0.03

≤ 0.30

≤ 0.80

≤ 0.10

≤ 0.70

≤ 0.025

S460NLH

≤ 0.22

≤ 0.60

1.00-1.70

≤ 0.030

≤ 0.025

≤ 0.050

≤ 0.20

≥ 0.020

≤ 0.03

≤ 0.30

≤ 0.80

≤ 0.10

≤ 0.70

≤ 0.025

Carbon Equivalents (CEV) %

GRADE	Maximum Carbon Equivalent (CEV)
	For specified thickness mm
	≤ 16	> 16 ≤ 40
S275NH	0.40	0.40
S275NLH	0.40	0.40
S355NH	0.43	0.43
S355NLH	0.43	0.45
S420NH	0.50	0.52
S420NLH	0.50	0.52
S460NH	0.53	0.55
S460NLH	0.53	0.55

Mechanical properties

GRADE	Min. Yield Strength (ReH) MPa		Tensile Strength (Rm) MPa	Elongation % Minimum		Minimum Impact Strength*
	Specified thickness mm		Specified thickness mm	Specified thickness mm		T°C	J
	= 16	> 16 = 40		Long.	Transv.
S275NH	275	265	370-510	24	22	-20	40
S275NLH	275	265	370-510	24	22	-50	27
S355NH	355	345	470-630	22	20	-20	40
S355NLH	355	345	470-630	22	20	-50	27
S420NH	420	400	520-680	19	17	-20	40
S420NLH	420	400	520-680	19	17	-50	27
S460NH	460	440	540-720	17	15	-20	40
S460NLH	460	440	540-720	17	15	-50	27

FINE GRAIN, HIGH STRENGTH, QUENCH AND TEMPERED STEELS

application in the construction of bridges, cranes, off-shore structures, buildings, ships and other structures where reduction of dead weight without any loss of load bearing capacity is critical.

Typical characteristics of these tubes are high yield strengths and good toughness with the guarantee of chemistry that is suitable for welding. Tubes are produced as per following chemical analysis that guarantee the required mechanical properties which generally conform to EN 10297 specifi cation.

CHEMICAL ANALYSIS (%)

C	Mn	vc	P	S	Ni	V	Cr	Mo
≤0.20	≤1.70	≤0.60	≤0.025	≤0.015	≤1.20	≤0.12	≤0.50	≤0.50

Mechanical Properties

GRADE	TENSILE PROPERTIES					IMPACT TEST*
	Rp02 (MPa) min		Rm (MPa) min		A %	Charpy KV long.		Charpy KV Trasv.
					long. min		(J min)
	Wall thickness mm					Temperature
	≤ 20	> 20 ≤ 40	≤ 20 ≤	> 20 ≤ 40 ≤		-20 °C	-50 °C	-20 °C	-50 °C
HS620	620
HS690	690	650	770-960	720-930	16	55	-	27	-
HS770	770	700	820-1000	750-960	15	50	-	27	-
HS790	790

Sizes

circular hollow - sections

Outside	Wall thickness
Diameter	Mm
mm	8.0	2.6	2.9	3.2	3.6	4.0	4.5	5.0	5.6	6.3	7.1	8.0	8.8	10.0	12.5	16.0	20.0	30.0	40.0
21.3	1.08	1.20	1.32	1.43	1.57	1.71	1.86	2.01
33.7			2.20	2.41	2.67	2.93	3.24	3.54	3.88	4.26	4.66	5.07
42.4			2.82	3.09	3.44	3.79	4.21	4.61	5.08	5.61	6.18	6.79	7.29	7.99
48.3			3.25	3.56	3.97	4.37	4.86	5.34	5.90	6.53	7.21	7.95	8.75	9.45
60.3				4.51	5.03	5.55	6.19	6.82	7.55	8.39	9.32	10.3	11.2	12.4	14.7
76.1				5.75	6.44	7.11	7.95	8.77	9.74	10.8	12.1	13.4	14.6	16.3	19.6	23.7	27.7
88.9					7.51	8.38	9.37	10.3	11.5	12.8	14.3	16.0	17.4	19.5	23.6	28.8	34.0
101.6						9.63	10.8	11.9	13.3	14.8	16.5	18.5	20.1	22.6	27.5	33.8	40.2
114.3							12.2	13.5	15.0	16.8	18.8	21.0	22.9	25.7	31.4	38.8	46.5	62.4
139.7							15.0	16.6	18.5	20.7	23.2	26.0	28.4	32.0	39.2	48.8	59.0	81.2
168.3								20.1	22.5	25.2	28.2	31.6	34.6	39.0	48.0	60.1	73.1	102	127
177.8										26.6	29.9	33.5	36.7	41.4	51.0	63.8	77.8	109	136
193.7										29.1	32.7	36.6	40.1	45.3	55.9	70.1	85.7	121	152
219.1										33.1	37.1	41.6	45.6	51.6	63.7	80.1	98.2	140	177
244.5												46.7	51.2	57.8	71.5	90.2	111	159	202
273.0														64.9	80.3	101	125	180	230
Other outside diameter and wall thickness on request

SQUARE HOLLOW – SECTIONS

circular hollow - sections

Size	Wall thickness
mm	Mm
40x40	2.9	3.2	3.6	4.0	4.5	5.0	5.6	6.3	7.1	8.0	8.8	10.0	11.0	12.5	14.2	16.0	17.5	20.0
50x50	3.31	3.61	4.01	4.39	4.85	5.28	5.78	6.33	6.91
60x60	4.22	4.62	5.14	5.64	6.26	6.85	7.54	8.31	9.14	10.0
70x70	5.13	5.62	6.27	6.9	7.67	8.42	7.30	10.3	11.4	12.5	13.5	14.9	15.9	17.3
80x80		6.63	7.40	8.15	9.08	9.99	11.1	12.3	13.6	15.0	16.3	18.0	19.4	21.3
80x80			8.53	9.41	10.5	11.6	12.8	14.2	15.8	17.5	19.0	21.1	22.8	25.2
90x90			9.66	10.7	11.9	13.1	14.6	16.2	18.1	20.1	21.8	24.3	26.3	29.1
100x100				11.9	13.3	14.7	16.3	18.2	20.3	22.6	24.5	27.4	29.7	33.0	33.6
110x110				13.2	14.7	16.3	18.1	20.2	22.5	25.1	27.3	30.6	33.2	37.0	41.0
120x120					16.1	17.8	19.9	22.2	24.7	27.6	30.1	33.7	36.6	40.9	45.5	50.1
140x140						21.0	23.4	26.1	29.2	32.6	35.6	40.0	43.5	48.7	54.4	60.1	64.7
150x150								28.1	31.4	35.1	38.4	43.1	47.0	52.7	58.9	65.2	70.2
Other outside diameter and wall thickness on request															[Weight in kg/m]

TOLERANCES

Tolerances will be as per EN 10297 specifications.

Tolerances according to EN 10210–2
Permissible deviation in external dimensions D, B and H …………….±1% With a minimum of ±0.5mm.

Tolerance on wall thickness T …. -10% for Seamless section, local deviation of -12.5% are permissible.

Permissible out-of-roundness 0 ………….2% out-of-roundness is calculated using the following equation:

0(%) =	Dmax – DMin	X 100
	D

In the case of square USH sections, the wall thickness in the straight edge area must be checked the upper layer of the wall thickness is determined by the maximum weight.

External Corner Profile

C1 and C2 = max. 3T (wall thickness) the distance between the intersection of the fl at side and the corner arc and the intersection of the projections of the fl at sides to the corner C1 and C2 shall be measured

Maximum permissible deviation of squareness of sides …± 1º

Permissible curvature of lateral surfaces concavity/convexity =1%.
The value of relative concavity or convexity is calculated as follows:

0(%) =	Dmax – DMin	X 100
	D

The Value of permissible concavity or convexity apply independent of the tolerances on External dimensions.

The maximum permissible twist V is calculated using the following formula: V = 2mm + 0.5mm/m

Permissible out-of-straightness = 0.2% related to the total section length, ie. 2mm/m

Maximum mass tolerance per section = ±6%, ±8%.

LENGHT AND PERMISSIBLE DEVIATIONS

Type of length	Available length(mm)	Permissible deviation	Ordering information re length
Mill length	6000 – 16,000	1)	none
Fixed length	≥2,000	±500	Required fixed length in mm
	≥2,000	–0 +10	Required fixed length in mm
	≤6,000
	>6,000	–0 +15

All the steel grades indicated in this brochure have been specially developed so that they have a low carbon equivalent and are easily weldable using traditional welding procedures (provided generally accepted technical rules are followed). For very thick sections, precautions should be taken to avoid cold cracking. In such cases, pre-heating prior to welding is advisable.

LENGHTS

Standard lengths supplied by ISMT are from 5 to 10 mtrs long. Tubes in exact length based on specific request can also be supplied.

END PREPARATION

Tubes with square cut ends or bevelled ends can be supplied.

PACKAGING AND MARKING

Each tube is oiled internally and externally and then packed into round/ hexagon bundles. This ensures that tubes are protected from corrosion and that tubes retain their straightness during transport. Our standard marking (painting) includes:
• Name and trade mark
• Dimensions
• Steel designation e.g. EN 10210 – S355J24
• Batch numbe

INSPECTION AND TESTING

Tubes are subjected to following tests (which conform to EN 10210)
• Cast analysis
• Tensile test
• Impact test
• Visual and dimensional check

ISMT manufactures carbon/alloy steel and seamless tubes for:
• Energy and Power Generation
• Automotive Components
• Hydraulic and Pneumatic Pressure Lines
• Hydraulic Cylinders
• Gas Cylinders
• Mining and Construction
• Bearings
• General Engineering Applications
• Oil and Petroleum Applications

Product details are available on request.

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(Vinnod B Mehta) : +91-98195 80099

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Stockist and Dealers of ISMT LTD.

Hitech Pipes & Tubes is Leading Exporters of ISMT LTD UHS Structural Tubes

Best Quality Steel Pipes !! Genuine Suppliers of ISMT UHS Structural Tubes, Look Up Quick Results Now!, Better Deal On Bulk ISMT UHS Structural Tubes., Supplier of ISMT UHS Structural Tubes India, Call us Now & Get Free Estimates!

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