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RUNHAI STEEL
Your Reliable Steel SupplierRunhai steel is not only a professional steel supplier, but also your trustworthy partner in China. We ensure quality and quantity, provide material certificates, and will refund if the products are not qualified, so please be assured the purchase. Regarding long-term cooperation or large orders, you can contact us for additional discounts.
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Carbon Steel Rectangular Tube
Carbon steel rectangular tube is a type of steel pipe with a square cross-section, mainly composed of elements such as carbon, manganese, silicon, phosphorus, sulfur, etc. Carbon steel square pipes are widely used in fields such as building structures, mechanical manufacturing, highway facilities, bridges and pipelines.
Product Video
Product Parameter
Welded steel pipe,also known as welded pipe, is a steel pipe made of steel plate or strip after crimping and welding, generally 6 meters. Welded steel pipe production process is simple, high production efficiency, variety specifications, less investment in equipment, but the general strength is lower than seamless steel pipe.Straight seam welded pipe, steel pipe made of hot or cold rolled steel plate or steel strip coil welding, straight seam welded pipe on welding equipment are called straight seam welded pipe.
① Seamless steel pipe
1.Grade:Q195/Q215/Q235/Q345/S235JR/GRB-D/STK500
2.Size: diemeter is from 21.5 in to406.4 mm,the thickness is from 0.6mmto 20mm the length is from m to 12m
3.Standard:SY/T5037-2000.GB/T9711.1-1997,GB/T9711.2API-5L，SY/T5040-92,ASTMA53A106，DIN1626,DIN1629,DIN2448JIS G3452JIS G3454JIS G3455JIS G3456JIS G3457JIS G3461
② welded pipe
1.Grade:Q195/Q215/Q235/Q345/S235JR/GRB-D/STK500
2.Size: diemeter is from 21.5 in to406.4 mm,the thickness is from 0.6mmto 20mm ,the length is from 1m to 12m
3.Standard:SY/T5037-2000.GB/T9711.1-1997，GB/T9711.2API-5L.SY/T5040-92 ASTMA53A106.DIN1626DIN1629DIN2448.JIS G3452JIS G3454JIS G3455JIS G3456JIS G3457JIS G3461
| Product Name | Carbon Steel Rectangular Tube |
| Standard | ASTM A106, ASTM A53, API 5L Gr.B, DIN17175,DIN1629 |
| Steel Grade | API 5L: GR B, X42,X46,X56, X60,X65,X70EN:S275,S275JR,S3SSJRH,S355J2HGB:Q195,Q215,Q235,Q345,L175,L210,L245, L320,L360-L555 |
| Materials | 10#,208,45*,Q235,Q345,Q195,Q215,Q345C.Q345AASTM A53A/A53B/ A178C/A106B APISLST37,ST37-2,DIN 1629 ST35,ST45,DIN 17175 ST35.8,DIN 17175 19Mn516Mn,Q345B,T1,T2,T5,T9,T11,T12,T22,T91,T92,P1,P2,P5,P9,P11,P12,P22,P91,P92.15CrMO,Cr5Mo.10CrMo910,12CrMo,13CrMo44,30CrMo,A333GR.1.GR.3,GR.6.GR.7Gr.B.X42,X46,X52,X60,X65,X70,X80,X100 |
| Technique | Hot rolled/cold rolled |
| Surface Treatment | Prime quality (bared, oiled,color paint,3UPE,or other anti-corrosive treatment) |
| Certification | CE,ISO,SGS,ETC |
| Packing | Waterproof paper,and steel strip packed.Standard Export Seaworthy Package.Suit forall kinds of transport,or as required |
| MOQ | 1 ton |
| Payments | T/T, L/C,Western union,Paypal, DP, etc |
| Application | Structure,Electric power transmission tower projects,Piling,Water,Oil & gas pipeline engineering,Mechanical industry, |
| Square Tube | Rectangle Tube | ||
| Size(mm) | Wall Thickness(mm) | Size(mm) | Wall Thickness(mm) |
| 20*20 | |||
| 25*25 30*30 |
1.2-3.0 | 20*40 30*40 | 1.2-3.0 |
| 40*40 50*50 |
1.2-4.75 | 30*50 25*50 30*60 40*60 |
1.2-4.75 |
| 70*70 75*75 80*80 90*90 100*100 |
1.5-5.75 | 60*80 50*80 100*40 120*80 |
1.5-5.75 |
| 120*120 140*140 150*150 |
2.5-10.0 | 160*80 100*150 140*80 100*180 200*100 |
2.5-10.0 |
| 160*160 180*180 200*200 |
3.5-12.0 | 200*150 250*150 | 3.5-12.0 |
| 250*250 300*300 350*350 |
4.5-15.75 | 250*200 300*200 350*200 350*250 450*250 400*300 500*200 |
4.5-15.75 |
| 280*280 400*400 |
5.0-20.0 | 400*350 400*250 500*250 500*300 400*600 |
5.0-20.0 |
Product Show
Carbon steel rectangular tube is a square metal pipe with simple manufacturing process, low cost, and wide application. This pipe is made of high-quality carbon steel material and is widely used in the construction, engineering, and manufacturing industries.
Product features
① Automatic equipment efficiency fast yearsof processing experience, master experi-ence, perfect equipment stable produc-tion.
② Selection of materials with a variety of specifications optional manufacturers supply,adequate supply, a variety of specifications optional, to meet your needs.
③ Years of industry experience quality assurance years of industry production experience, mature production process,product quality assurance.
④ To map to sample on-demand processing customization support product processing customization,according to customer needs for product processing customization.
| Chemical Properties % | |||||||||
| Grade A | |||||||||
| C | Mn | P | S | Si | Cr | Cu | Mo | Ni | V |
| 0.25 | 0.27-0.93 | 0.035 | 0.035 | 0.1 | 0.4 | 0.4 | 0.15 | 0.4 | 0.08 |
| Grade B | |||||||||
| C | Mn | P | S | Si | Cr | Cu | Mo | Ni | V |
| 0.3 | 0.29-1.06 | 0.035 | 0.035 | 0.1 | 0.4 | 0.4 | 0.15 | 0.4 | 0.08 |
| Grade C | |||||||||
| C | Mn | P | S | Si | Cr | Cu | Mo | Ni | V |
| 0.35 | 0.29-1.06 | 0.035 | 0.035 | 0.1 | 0.4 | 0.4 | 0.15 | 0.4 | 0.08 |
Carbon steel manufacturing process:
The smelting of carbon steel is usually carried out in converter and open hearth. Converters generally smelt ordinary carbon steel, while open furnaces smelt all kinds of high-quality steel. The technology of oxygen top blow converter is developing rapidly and it can replace open hearth furnace. The refined liquid steel is injected into the ingot mold to obtain various ingot. After the ingot is forged or rolled, it is processed into plates, strips, bars, and sections of various sectional shapes. Carbon steel is usually used directly in the hot rolled state. When used for manufacturing tools and various machine parts, it needs to be heat treated according to the requirements of use; As for steel castings, most of them are heat-treated.
Application
Black annealed rectangular hollow tube are usually used in engineering construction, glass curtain wall, door and window decoration, steel structure, guardrail, machinery manufacturing, automatic manufacturing, home appliance manufacturing,shipbuilding, container manufacturing, electric power, agricultural construction, agricultural shed, bicycle frame, shelves,fitness equipment fields. The surface of the galvanized layer can effectively prevent rust.
Packing & Delivery
| Package | Standard export seaworthy package,suit for all kinds of transport, or as required. |
| Water-proof Paper + Edge protection + Wooden Pallets | |
| Bulk Size | Any size |
| Loading Port | Tianjin, Qingdao Port or any China Seaport |
| Container | 1*20ft container load Max. 25 Ton, Max. length 5.8m |
| 1*40ft container load Max. 25 Ton, Max. Length 11.8m | |
| Delivery Time | 7-15 days or according to the order's quantity |
Customer Feedback
FAQ
Q: Will you delivery the goods on time?
A: Yes,we promise to provide best quality products and delivery on time .Honesty is our company's tenet.
Q: Do you provide samples ? is it free or extra ?
A: The sample could can provide for customer with free,but the courier freight will be covered by customer account.
Q: Do you accept the third party inspection?
A: Yes absolutely we accept.
Q: How could you guarantee your products?
A: Each piece of products is manufactured by certified workshops, inspected byRUNHAIpiece by piece according to national QA/QC standard. We also could issue the warranty to customer to guarantee the quality.
Q: How do we trust your company?
A: We specialise in steel business for years, headquarter locates in Jinan, Shandong province, you are welcome to investigate in any ways, by all means, you could place an order with trade assurance which could secure your payment.
Q: How can I get your quotation as soon as possible?
A: The email and fax will be checked within 24 hours,meanwhile,theFacebook,Skype,Wechat and WhatsApp will be online in 24 hours.Please send us your requirement and order information,specification(Steel grade,size,quantity,destination port),we will work out a best price soon.
