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Raian Ionescu

Material quality very good. we have cooperate more than 10 Years. They trade lots kinds of steel material. All material quality good. They duty for all material quality. We are planing continue cooperate with them in the future

Contact Person : Gao Ben

Phone Number : 18068357371

Whatsapp : +8618068357371

S355JR Carbon Steel Seamless Square Tube with Black Surface Treatment in 3030-500500 Sizes

Minimum Order Quantity	50 Tons
Price	US $650-1,250 / Ton

Product Details

Section Shape	Square	Size Range	3030-500500
Material Grade	S355JR, S275JR, S355J0	Thickness Range	1.2mm-30.0mm
Yield Strength	355 N/mm² (≤16mm)	Tensile Strength	510-680 N/mm²
Elongation	22% (3≤d≤40mm)	Chemical Composition C	≤0.24%
Chemical Composition Si	≤0.55%	Chemical Composition Mn	≤1.60%
Chemical Composition P	≤0.035%	Chemical Composition S	≤0.035%
Surface Treatment	Black, Galvanized Or Painted	Production Capacity	10,000MT/month
MOQ	10 Tons Per Size
Highlight	S355JR Square Steel Tube , Black Surface Treatment Seamless Square Tube , 3030-500500 Carbon Steel Square Tube

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Product Description

Steel Square Tube S355JR S275JR S355J0 Carbon Steel Seamless Square Tube

High-quality carbon steel seamless square tubes available in various grades including S355JR, S275JR, and S355J0, designed for structural applications requiring superior strength and durability.

Product Specifications

Available Products & Dimensions

Product Type	Size Range	Thickness	Length
Round Pipe	OD10mm - 1000mm	4mm - 30mm	Custom lengths available
Square Pipe	10mm×10mm - 1000mm×1000mm	1.2mm - 30.0mm	Custom lengths
Rectangle Pipe	20mm×40mm - 400mm×700mm	1.2mm - 30.0mm	Custom lengths
L/T/Z Window Section	28mm/38mm	0.5mm - 1.5mm	Custom lengths

Additional Product Details

Materials: SS400, S235JR, S275JR, S355JR, 1020, 1045, 4140, etc.
Surface Treatment: Black, galvanized, or painted
Packing: Export standard packing (bundles, seaworthy package, shipped in container)
Delivery Port: Shanghai, China
Lead Time: Within 30 days after receiving original L/C or deposit
Minimum Order Quantity: 10 Tons per size
Production Capacity: 10,000MT per month

Applications

Widely used in structural applications, motorbike and automobile manufacturing, ornamental uses, medical equipment, sport equipment, and home furniture.

EN 10025 S355 Steel Grades

S355 steel is a European standard structural steel grade according to EN 10025-2:2004, offering superior properties compared to S235 and S275 steels in yield strength and tensile strength.

S355 Steel Grade Designations

S355JR (1.0045): Minimum 27J impact energy at room temperature (20°C)
S355J0 (1.0553): Minimum 27J impact energy at 0°C
S355J2 (1.0577): Minimum 27J impact energy at -20°C
S355K2 (1.0596): Minimum 40J impact energy at -20°C

Technical Data Sheets

Chemical Composition

Steel Grade	C (%)	Si (%)	Mn (%)	P (%)	S (%)	Cu (%)	N (%)	Deoxidation
S355JR	≤0.24	≤0.55	≤1.60	≤0.035	≤0.035	≤0.55	≤0.012	Rimmed steel not allowed
S355J0	≤0.20	≤0.55	≤1.60	≤0.030	≤0.030	≤0.55	≤0.012	-
S355J2	≤0.20	≤0.55	≤1.60	≤0.025	≤0.025	≤0.55	-	Fully killed
S355K2	≤0.20	≤0.55	≤1.60	≤0.025	≤0.025	≤0.55	-	Fully killed

Mechanical Properties - Yield Strength (≥ N/mm²)

Thickness (mm)	d≤16	16< d ≤40	40< d ≤63	63< d ≤80	80< d ≤100	100< d ≤150	150< d ≤200	200< d ≤250
S355 Grades	355	345	335	325	315	295	285	275

Mechanical Properties - Tensile Strength (≥ N/mm²)

Thickness (mm)	d<3	3 ≤ d ≤ 100	100 < d ≤ 250
S355JR	510-680	470-630	450-600
S355J0/J2/K2	510-680	470-630	450-600

Mechanical Properties - Elongation (≥%)

Thickness (mm)	3≤d≤40	40< d ≤63	63< d ≤100	100< d ≤150	150< d ≤250
S355JR	22	21	20	18	17
S355J0/J2/K2	20	19	18	18	17

Product Gallery

Company Overview

We are a comprehensive steel pipe enterprise integrating production, processing, and sales. Our main business includes steel tubes, square tubes, seamless square tubes, thick wall square tubes, cold drawn square tubes, and various specialized steel tube products.

Product Range

We offer a complete range of square tube and rectangular tube specifications from 20×20mm to 800×800mm square tubes and 20×30mm to 400×800mm rectangular tubes, with thickness ranging from 0.6mm to 28mm, totaling over 2,800 different specifications.

Manufacturing Partnerships

We maintain excellent cooperative relationships with major steel pipe factories including Tianjin Seamless Steel Pipe Factory, Baotou Steel Pipe Factory, Chengdu Steel Pipe Factory, Wuxi Steel Pipe Factory, and Baosteel Steel Pipe Factory.

Applications

Our products serve various industries including steel structures, large venues, exhibition centers, lifting machinery, shipbuilding, storage shelves, decoration, transportation facilities, airport construction, railway vehicles, bridge support, mine support, and many other industrial applications.

Company Advantages

Competitive Prices

We maintain strong sales foundations and financial strength with diversified operational modes, establishing strategic cooperative partnerships with steel manufacturers to ensure competitive pricing and market leadership.

Quality Assurance

Professional quality control from procurement to sales, with comprehensive quality audits and continuous tracking of steel mill quality to ensure reliable product performance.

Sincere Service

24-hour distribution service with multiple transportation options including automobile, railway, and ship. Complete steel product portfolio with simplified ordering processes via telephone, telex, and internet platforms.

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S355JR Carbon Steel Seamless Square Tube with Black Surface Treatment in 30*30-500*500 Sizes

S355JR Square Steel Tube

Black Surface Treatment Seamless Square Tube

30*30-500*500 Carbon Steel Square Tube

S355JR Carbon Steel Seamless Square Tube with Black Surface Treatment in 3030-500500 Sizes

3030-500500 Carbon Steel Square Tube