Cold Formed Round Steel Pipe (CHS) is manufactured from hot rolled coil with a smooth blue/grey finish and raised internal welds. Due to its good strength and weldability, cold-formed round tubes are commonly used as structural sections and are widely used in different industries.

The main forming process of the tube is carried out at room temperature, which has the additional effect of work hardening and strengthening the material, thereby further improving the mechanical properties of the material, but at the same time it is not as ductile as hot rolled steel pipe. Cold-formed structural tubes without subsequent heat treatment comply with the EN 10219 standard.

Cold-rolled steel pipes have higher surface properties and dimensional accuracy for technically precise applications or those with high aesthetic requirements.

The main application areas of cold formed round tubes are as follows:
Fencing and Security
Automobile, motorcycle, bicycle industry
road and rail infrastructure
Metal structures and composite steel and concrete structures

The diameter of the cold-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 10219-2 : 2006
Steel pipe material grade:S235JRH，S275J0H，S275J2H，S355J0H，S355J2H，S275NH，S420MH，S460MH，S500MC，S700MC

Cold-formed round tubes can be used in their natural state or can be shot peened, primed or sawn cut.
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 (Min.)	Ti	Ni	Mo	N
S275MH	0.13	0.50	1.50	0.035	0.030	0.050	0.08	0.020	0.050	0.30	0.20	0.020
S275MLH				0.030	0.025
S420MH	0.16	0.50	1.70	0.035	0.030	0.050	0.12	0.020	0.050	0.30	0.20	0.020
S420MLH				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
S275MH	275	265	—	—	—	—	360~510	360~510	—
S275MLH
S420MH	420	400	—	—	—	—	500~660	500~660	—
S420MLH

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	—	—
S275MH	24	—	—	—	—	40	—	—
S275MLH					27	—	—	—
S420MH	19	—	—	—	—	40	—	—
S420MLH					27	—	—	—