China Black Square Steel Pipe Seamless Black Annealed Steel Square Tube Rectangular Low Carbon Hollow Section Tube

• Type: Welded, Seamless
• Technique: Hot Rolled
• Material: Carbon Steel
• Surface Treatment: Lightly Oiled, Hot DIP Galvanized...
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Outer Diameter: 219mm-3620mm, or as Required.
• Thickness: 5mm-25.4mm, or as Required.
• Length: 3m-12m, or as Required.
• Grade: API 5L: Psl1/Psl2 Gr.a, Gr.B, X42, X46, X52
• Delivery Time: 7-15 Days
• Transport Package: Standard Sea-Worthy Package or as Required
• Specification: As requirement
• Trademark: DELONG
• Origin: Shandong
• HS Code: 7222400000
• Production Capacity: 5000 Tons/Month

Product Description

 

Square tubes are classified according to their cross-sectional shapes: simple cross-section square tubes: square tubes and rectangular tubes. After the process is processed, it is rolled into strip steel. Generally, the strip steel is unpacked, flattened, crimped, and welded into a round tube, then the round tube is rolled into a square tube, and then cut to the required length. According to the production process, the square tube is divided into: hot-rolled seamless square tube, cold-drawn seamless square tube, extruded seamless square tube, and welded square tube. Rectangular pipes are divided into ultra-thick-walled rectangular pipes, thick-walled rectangular pipes and thin-walled rectangular pipes according to their wall thickness.

Product	Square and Rectangular Steel Pipe
Material	Carbon Steel
Grade	GB: Q195, Q215, Q235A, Q235B, Q235C, Q235D, Q255A, 255B,  Q275, Q295A, Q295B, Q345B, Q345C, Q345D, Q345E, Q390A, Q390B, Q390C, Q390D, Q390E, Q420, Q420B, Q420C, Q420D, Q420E, Q460D, Q460E, Q500D, Q500E, Q550D, Q550E, Q620D, Q620E, Q690D, Q690E EN:  S185, S235JR, S275JR, S355JR, S420NL, S460NL S500Q, S550Q, S620Q, S690Q ASTM:  Grade B, Grade C, Grade D, A36, Grade 36, Grade 40, Grade 42, Grade 50, Grade 55, Grade 60, Grade 65, Grade 80 JIS: SS330, SPHC, SS400, SPFC, SPHD, SPHE
Standard	ASTM, DIN, ISO, EN, JIS, GB, etc.
Surface	Galvanized, 3PE, painting, coating oil, steel stamp, drilling, etc.
Ends	Plain ends
Specification	OD: 20*20-500*500mm ; 10*20-300*500mm, or as required.
	Thickness: 1.0-30.0mm, or as required.
	Length: 2-12m, or as required.
Pipe ends	Plain, Beveled, Threaded, Socket with holes, With PVC clap/ coupling/ clamp
Application	Widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobiles Industry, railway, highway guardrail, container frame, furniture, decoration, steel structure, etc.
Tolerance	±1%
MOQ	1 ton
Supply Ability	5000 tons / month
Lead Time	7-15 working days after the receipt of 30% deposit
Payment Terms	30%T/T Advance + 70% Balance
Price Terms	FOB, CFR, CIF, EXW
Packing	Standard sea-worthy package or as required

Mechanical character & Chemical element of normal material:

Material	Q195	C	Mn	Si	S	P
Chemical		0.06-0.12	0.25-0.50	≤0.30	≤0.050	≤0.045
Composition		Tensile strength: 315-430(Mpa)
(%)		Yield strength:195(Mpa)
		Elongation:33
	Q235	C	Mn	Si	S	P
		0.12-2.0	0.3-0.70	≤0.30	≤0.045	≤0.045
		Tensile strength: 375-460(Mpa)
		Yield strength:235(Mpa)
		Elongation:26
	Q345	C	Mn	Si	S	P	V
		≤0.20	≤1.70	≤0.55	≤0.040	≤0.040	0.02-0.15
		Tensile strength: 470-630(Mpa)
		Yield strength:345(Mpa)
		Elongation:21

 

Rectangular Hollow Section				Square Hollow Section
Size	Thickness	Size	Thickness	Size	Thickness
mm	mm	mm	mm	mm	mm
50 X 25	2	120 X 40	3	20 x 20	2
50 X 25	2.5	120 X 40	3.6	20 x 20	2.5
50 X 25	3	120 X 40	4	25 x 25	2
50 X 30	2.5	120 X 40	5	25 x 25	2.5
50 X 30	3	120 X 40	6	25 x 25	3
50 X 30	3.2	120 X 40	6.3	30 x 30	2.5
50 X 30	4	120 X 60	3	30 x 30	3
60 X 40	2.5	120 X 60	3.6	40 x 40	2
60 X 40	3	120 X 60	4	40 x 40	2.5
60 X 40	3.2	120 X 60	5	40 x 40	3
60 X 40	4	120 X 60	6	40 x 40	4
80 X 40	3	120 X 60	6.3	50 x 50	2
80 X 40	3.2	120 X 80	3	50 x 50	2.5
80 X 40	4	120 X 80	4	50 x 50	3
80 X 60	2.5	120 X 80	5	50 x 50	4
80 X 60	3	120 X 80	6	50 x 50	5
80 X 60	3.6	120 X 80	6.3	60 x 60	3
80 X 60	4	150 X100	3	60 x 60	4
80 X 60	5	150 X100	4	60 x 60	5
90 X 50	2.5	150 X100	5	70 x 70	3
90 X 50	3	150 X100	6	70 x 70	3.6
90 X 50	3.6	150 X100	6.3	70 x 70	5
90 X 50	4	160 X 80	3	80 x 80	3
90 X 50	5	160 X 80	4	80 x 80	3.6
100 X 40	3	160 X 80	5	80 x 80	5
100 X 40	3.6	160 X 80	6	80 x 80	6
100 X 40	4	160 X 80	6.3	90 x 90	3
100 X 40	5	200 X 100	4	90 x 90	3.6
100 X 50	3	200 X 100	5	90 x 90	5
100 X 50	3.6	200 X 100	6	90 x 90	6
100 X 50	4	200 X 100	6.3	100 x 100	4
100 X 50	5	200 X 100	8	100 x 100	5
100 X 50	6	200 X 100	10	100 x 100	6
100 X 50	6.3	200 X 100	12.5	100 x 100	8
100 X 60	3	200 X 100	16	100 x 100	10
100 X 60	3.6	250 X 150	6.3	120 x 120	5
100 X 60	4	250 X 150	8	120 x 120	6
100 X 60	5	250 X 150	10	120 x 120	8
100 X 60	6	250 X 150	12.5	120 x 120	10
100 X 60	6.3	250 X 150	16	150 x 150	5
100 X 80	3	300 X 200	6.3	150 x 150	6
100 X 80	3.6	300 X 200	8	150 x 150	8
100 X 80	4	300 X 200	10	150 x 150	10
100 X 80	5	300 X 200	12.5	180 x 180	6
100 X 80	6	300 X 200	16	180 x 180	8
100 X 80	6.3	400 X 200	10	180 x 180	10
		400 X 200	12.5	180 x 180	12.5
		400 X 200	16	200 x 200	6
		450 X 250	10	200 x 200	8
		450 X 250	12.5	200 x 200	10
		450 X 250	16	200 x 200	12.5
				250 x 250	8
				250 x 250	10
				250 x 250	12.5
				300 x 300	8
				300 x 300	10
				300 x 300	12.5

Chemical & Mechanical Properties of Carbon Steel Square Pipes

Standard	Grade	Chemical Components (%)					Mechanical Properties
		C	Si	Mn	P	S	Tensile Strength (Mpa)	Yield Strength(Mpa)
ASTM AS3	A	≤0.25	-	≤0.95	≤0.05	≤0.06	≥330	≥205
	B	≤0.30	-	≤1.2	≤0.05	≤0.06	≥415	≥240
ASTM A106	A	≤0.30	≥0.10	0.29-1.06	≤0.035	≤0.035	≥415	≥240
	B	≤0.35	≥0.10	0.29-1.06	≤0.035	≤0.035	≥485	≥275
ASTM A179	A179	0.06-0.18	-	0.27-0.63	≤0.035	≤0.035	≥325	≥180
ASTM A192	A192	0.06-0.18	≤0.25	0.27-0.63	≤0.035	≤0.035	≥325	≥180
API  5L PSL1	A	0.22	-	0.9	0.03	0.03	≥331	≥207
	B	0.28	-	1.2	0.03	0.03	≥414	≥241
	X42	0.28	-	1.3	0.03	0.03	≥414	≥290
	X46	0.28	-	1.4	0.03	0.03	≥434	≥317
	X52	0.28	-	1.4	0.03	0.03	≥455	≥359
	X56	0.28	-	1.4	0.03	0.03	≥490	≥386
	X60	0.28	-	1.4	0.03	0.03	≥517	≥448
	X65	0.28	-	1.4	0.03	0.03	≥531	≥448
	X70	0.28	-	1.4	0.03	0.03	≥565	≥483
API  5L PSL2	B	0.24	-	1.2	0.025	0.015	≥414	≥241
	X42	0.24	-	1.3	0.025	0.015	≥414	≥290
	X46	0.24	-	1.4	0.025	0.015	≥434	≥317
	X52	0.24	-	1.4	0.025	0.015	≥455	≥359
	X56	0.24	-	1.4	0.025	0.015	≥490	≥386
	X60	0.24	-	1.4	0.025	0.015	≥517	≥414
	X65	0.24	-	1.4	0.025	0.015	≥531	≥448
	X70	0.24	-	1.4	0.025	0.015	≥565	≥483
	X80	0.24	-	1.4	0.025	0.015	≥621	≥552