Hot rolled steel pipes are made to specific physical dimensions by passing metal sheets through rolls. Finished surface rough, welded structure or seamless structure. Hot-formed structural square steel pipes have a smaller fillet radius, which improves the appearance of hollow profiles and avoids the risk of brittle fractures that sometimes occur in cold-formed hollow profiles. It achieves an extremely high level of formability and dimensional consistency, with exceptional weldability.

The void area of the thermoformed square tube has no white spots and internal stress, it can save material cost and have a lighter structure. This product is generally used in the industrial field to complete some structural related tasks, such as structural engineering (bridge, highway construction, etc.), industrial equipment, mechanical parts, road signs, deck railings, etc.

Advantages of thermoformed square tubes:
Good strength-to-weight ratio, uniform size, shape and strength tolerances, excellent processability, cost-effective.

S275J0H Thermoforming Square Tube:
Due to its light weight, installation and removal are relatively easy. It is superior to cold formed steel pipe because it can work well at any temperature. Applications: Structural support for automobiles, buildings and bridges, railway stations, mass rapid transit, bus stops, harbour facilities, theme parks, park rides, etc.

S275J2H Thermoforming Square Tube:
This grade is mainly used in high temperature environments. Features: Seamless Finish, Shear Strength, High Durability, Rugged Construction.

S355J0H Thermoforming Square Tube:
No additional maintenance and maintenance is required for a long time, and it is characterized by good strength, high conductivity, easy disassembly, good quality and durability. Hot-formed S355J0H square steel pipes have better properties than cold-formed ones.

S355J2H Cold Formed Square Tube:
Made by a high frequency induction welding process, it is suitable for both exterior and interior applications. There is no internal stress at all, the manufacturing coefficient is high, the material is light in structure, and the cost is saved.

The available grades of square steel pipes are EN, ASTM, GB and JIS.
The section size of the hot-formed structural square steel pipe can reach 800mm, the thickness can reach 35mm, 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. This meets almost all international quality standards and undergoes various tests.

Steel pipe implementation standard:EN 10210-2 : 2006
Steel pipe material grade:S235JRH，S275J0H，S275J2H，S355J0H，S355J2H，S275NH，S420NLH，S420NH， IS 4923 / ASTM A500

Thermoformed square tubes can be used in their natural state or can be shot peened, primed sawed, drilled or milled.
Surface Protection: Black (Natural Uncoated), Clear/Oil Coated, Pre-Galvanized, Hot-Dip Galvanized
Metal slings are generally bundled into rectangles for storage and transportation.

European Standard BS EN 10210-2: 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	—
S275MLH					—	27	—	—
S420NH	19	19	—	—	—	40	—	—
S420NLH					27	—	—	—