Hot-formed structural round steel pipe is carbon steel rolled at a temperature above its recrystallization point (usually about 1000 degrees Fahrenheit). When steel is heated beyond the recrystallization point, it becomes more ductile and forms easily. So thermoformed round steel pipes are easy to cut, weld, form and machine.

The dimensions and characteristics of thermoformed structural round tubes are in accordance with EN10210-1, and the tolerances are in accordance with EN10210-2.

Hot-formed steel pipes have good strength and weldability, complete stress relief, and uniform mechanical properties.
The advantages of this type of steel pipe are: increased durability, improved toughness, ease of processing, ease of welding, and more affordable than cold-rolled steel pipe.
As hot-rolled steel pipes cool, they shrink unevenly, making it difficult to precisely control the size and shape of the finished hot-rolled steel pipe.

The main application areas of thermoformed round tubes are as follows:
bridge structure
frame structure of building
Mechanical frame structure
Office and Public Furniture
Engine mounts, bushings

The diameter of the hot-formed structure round steel pipe can be up to 1219mm, and the normal supply length is 6m~12m, but other lengths of 4m~16m can be provided upon request. Additionally, other lengths are available upon request.

Steel pipe implementation standard:EN 10210
Steel pipe material grade:S235JRH，S275J0H，S275J2H，S355J0H，S355J2H，S275NH，S420NLH，S420NH，S460NH，S460NLH

The material of thermoformed round tubes has different surface treatments such as polishing, annealing, pickling and bright annealing.
Surface Protection: Black (Natural Uncoated), Clear/Oil Coated, Hot Dip Galvanized, Paint Shop Primer.
Hexagonal packaging is generally used for storage and transport, i.e. tied into a hexagonal form with metal slings to optimize its protection and handling.

European Standard BS EN 10219-1:2006

grade	The chemical composition is not more than Max.(%)
	C	Si	Mn	P	S	N
S235JRH	0.17	—	1.4	0.040	0.040	0.009
S275J0H	0.20	—	1.5	0.035	0.035	0.009
S275J2H	0.20	—	1.5	0.030	0.030	—
S355J0H	0.22	0.55	1.6	0.035	0.035	0.009
S355J2H	0.22	0.55	1.6	0.030	0.030	—

grade	The chemical composition is not more than Max.(%)
	C	Si	Mn	P	S	Nb	V	Al	Ti	Cr	Ni	Mo	Cu	N
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				0.030	0.025

grade	Yield strength not less than Min.（N/mm2）						tensile strength（N/mm2）
	t≤16	16<t≤40	40<t≤63	63<t≤80	80<t≤100	100<t≤120	t≤3	3<t≤100	100<t≤120
S235JRH	235	225	215	215	215	195	360~510	360~510	350~500
S275J0H	275	265	255	245	235	225	430~580	410~560	400~540
S275J2H
S355J0H	355	345	335	325	315	295	510~680	470~630	450~600
S355J2H
S420NH	420	400	390	—	—	—	520~680	520~680	—
S420NLH

grade	The elongation is not less than Min.（%）				Minimum impact energy KV（J）
	t≤40	40<t≤63	63<t≤100	100<t≤120	-50℃	-20℃	0℃	+20℃
S235JRH	26（24）	25	24	22	—	—	—	27
S275J0H	23（20）	22	21	19	—	—	27	—
S275J2H					—	27	—	—
S355J0H	22（20）	21	20	18	—	—	27	—
S355J2H					—	27	—	—
S420MH	19	19	—	—	—	40	—	—
S420MLH					27	—	—	—