400*400 square tube large diameter tube square hollow section SHS / RHS thick wall tube Thick Wall Square Hollow Section, SHS / RHS Hollow Steel Tube 400 * 400 Description: Thick wall tube, welded tube, black, construction tube, square tube, Q345B, structure tube Standard: DIN EN 10210, DIN EN 10219, ASTMA500, GB/T 3094-2000, GB/T 6728-2002, GB/T178-2005, JISG3466, ASTM-A53. BS1387, JIS-G3444, GB/T3091-2001 Material: 20#, Q195, Q235, Q345, St 52, St 37, St 44, S355 JO H, S235 JR Size: 100mm*100mm 150mm*150mm 200mm*200mm 300mm*300mm 400mm*400mm Wall Thickness: 3-16mm Length: As customer's requirement Packing: Standard export packing in bundles Surface: Plain or Galvanized, as per customer's request Technique: Welded Applications: Square Tubes are widely used in building structure and other fields. We can produce other specifications according to customers’ requirements. Our company specializes in manufacturing of steel pipes for structures, electric power transmission project, pipeline of fluid use like water, oil and gas, piling, mechanical industry and municipal project. It has close relationships with many large steel corporations. So it supplies complete steel products according to customers’ requirements. The products it mainly supplies are: ERW longitudinally welded steel pipes in accordance with DIN, EN, ASTM and API standards. Steel hollow sections hot and cold formed in accordance with ASTM 500, EN 10210 and EN 10219. Seamless steel pipes with heavy wall thickness in accordance with EN 10210, EN 10216, EN 10297, API 5L, ASTM 106, ASTM A53, DIN 2440 – DIN 1629. Galvanized steel pipes and tubes in accordance with ASTM A53, ASTM A106, DIN 2440/2444, BS 1387, and JIS C8305 standards. Hot rolled steel beams H & I in accordance with JIS, DIN, ASTM standards. Hot rolled steel round bars in accordance with AISI, ASTM, BS, DIN and JIS standards. Hot & cold rolled steel products of steel strips, steel coils and steel sheets in commercial qualities and in accordance with DIN, EN, and ASTM standards Further steel products are welcome upon customers’ requests.

Founded in 1993, Hangzhou Heavy Steel Pipe Company is an integrated company integrating R&D, production, operation, trade and service. The company has its own brand WUFU and specializes in manufacturing of steel pipes for structures, electric power transmission project, pipeline of fluid use like water, oil and gas, piling, mechanical industry and municipal project. It has close relationships with many large steel corporations. So it supplies complete steel products according to customers' requirements.

The products it mainly supplies are:

Longitudinally welded steel pipes
ERW:
Size range: O.D from 21.3mm to 508mm, W.T from 2.3mm to 16mm
LSAW:
Size range: O.D from 351mm to 1500mm, W.T from 8.0mm to 40mm
Standard:
ASTM A53, ASTM A106, API 5L, EN10204, DIN1626
Steel Grade: ST37, ST52, S235, S275, S355, GR A, GR B, X52, X60.,ect.

Steel Hollow Sections (hot & cold formed)
Square:
Size Range: from 16*16mm to 400*400mm, W.T from 0.6mm to 16mm
Rectangular:
Size Range: from 20*10mm to 500*300mm, W.T from 0.6mm to 16mm
Standard:
EN10210, EN10219, ASTM A500
Steel Grade: S235, S275, S355.,ect

Seamless steel pipes
Size range: O.D from 21.3mm to 610mm, W.T from 2.3mm to 50mm
Standard: EN10210, EN10216, EN10297, ASTM A53, ASTM A106, API 5L, DIN1629, DIN2440
Steel Grade: E235, E275, E355, E470 ST37, ST44, ST52, S355J2H.,ect

Hot dipped galvanized steel pipes
Size range: O.D from 21.3mm to 219mm, W.T from 2.3mm to 6mm
Standard: ASTM A53, ASTM A106, BS1387-1985, DIN2440/2444, EN10255
Steel Grade: ST37, ST52, S235, S275, S355, GR A.,ect

Hot rolled steel H beams
Size range: HW100-400, HM150-600, HN150-900, HE100-500, IPE140-500, HP305
Standard:
JIS G3101, JIS G3106, JIS G3136, JIS G3192, KS D3503, KS D3502, EN10034, EN10025, ASTM 572A, ASTM A6, ASTM A36
Steel Grade:
SS400, SS490, SM490, SN490, S235J0, S235J2,S235JR, S275JR, S275J0, S275J2, S355J0, S355J2, S355JR, S355J2+N, GR50, GR55, GR60, GR65, A36, A43, D36, DH36

Steel round bars (hot rolled & forged)
Size range: from 16mm to 260mm & 300mm to 800mm
Steel Grade: Q215, Q235, Q345, C45N, S355J2G3, 39NICRMO3, 42CRMO4, 18NICRMO5
Surface: rough machine turned
Length: Minimum 3 meters
Tests: UT SEP 1921 class CC

Hot rolled steel (strips, coils, sheets, plates, slabs)
In commercial qualities and in accordance with DIN, EN, and ASTM standards, black