Q420/Q420B/Q420C/Q420D/Q420E Carbon Steel Tube/Pipe

Q420/Q420B/Q420C/Q420D/Q420E Carbon Steel Tube/Pipe - Image 3

Q420/Q420B/Q420C/Q420D/Q420E Carbon Steel Tube/Pipe - Image 4

Q420/Q420B/Q420C/Q420D/Q420E Carbon Steel Tube/Pipe - Image 5

Q420 series steel plates are medium-to-high strength low-alloy structural steels. By precisely controlling the alloy composition (such as vanadium, niobium, and titanium) and the rolling process, they achieve higher strength while also taking into account good low-temperature toughness and processability. Their core positioning is to replace traditional medium-carbon steel and are used for key structural parts that withstand high loads, complex stresses, or harsh environments (such as low temperatures and dynamic loads). They are widely used in large bridges, super-high-rise buildings, heavy machinery, wind turbine towers, marine engineering, and high-pressure vessels.

Categories: Carbon Steel, Carbon Steel Tube/Pipe

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Carbon Steel Tube/Pipe

Product Introduction

Product Description

Product Name	Seamless Carbon Steel Pipe
Material	A53, ST33, A283, A135, ST37, A53, A106, ST35 , A179, A214, A192, A226, A315, ST42, A106-B
Outside	8~100mm
Wall Thickness	2mm~15mm
Unit Length	3m, 5.8m, 6m, 11.8m, 12m, 13.5m or as per customers’ request
Surface	Bare surface, varnish painting, galvanizing, other painting as per customers’ request
Price Terms	FOB, CRF, CIF, EXW all acceptable
Delivery Detail	Inventory about 5-7; custom-made 25-30

Chemical Composition

Grade	C	Si	Mn	P	S	Cu	Cr	Ni
Cor-ten A	0.12	0.25-0.75	0.20-0.50	0.01-0.2	0.03	0.25-0.55	0.5-1.25	0.65
Cor-ten B	0.16	0.3-0.5	0.8-1.25	0.03	0.03	0.25-0.40	0.4-0.65	≤0.4
SPA-H	0.12	0.2-0.75	0.60	0.07-0.15	0.035	0.25-0.55	0.3-1.25	0.65
9CuPCrNi-A	0.12	0.2-0.75	0.20-0.50	0.07-0.15	0.040	0.25-0.55	0.3-1.25	0.65
Q235NH	0.13	0.10-0.40	0.20-0.60	0.03	0.030	0.25-0.55	0.40-0.80	0.65
Q295NH	0.15	0.10-0.50	0.30-1.00	0.03	0.030	0.25-0.55	0.40-0.80	0.65
Q355NH	0.16	0.5	0.50-1.50	0.03	0.030	0.25-0.55	0.40-0.80	0.65
Q415NH	0.12	0.65	1.10	0.025	0.030	0.20-0.55	0.30-1.25	0.12-0.65
Q460NH	0.12	0.65	1.50	0.025	0.030	0.20-0.55	0.30-1.25	0.12-0.65
Q500NH	0.12	0.65	2.0	0.025	0.030	0.20-0.55	0.30-1.25	0.12-0.65
Q550NH	0.12	0.65	2.0	0.025	0.030	0.20-0.55	0.30-1.25	0.12-0.65
Q265GNH	0.12	0.10-0.40	0.20-0.50	0.07-0.12	0.020	0.2-0.45	0.30-0.65	0.25-0.50
Q295GNH	0.12	0.10-0.40	0.20-0.50	0.07-0.12	0.020	0.25-0.45	0.30-0.65	0.25-0.50
Q310GNH	0.12	0.25-0.75	0.20-0.50	0.07-0.12	0.020	0.25-0.55	0.30-1.25	0.65
Q355GNH	0.12	0.20-0.75	1.00	0.07-0.15	0.020	0.25-0.55	0.30-1.25	0.65
Q345GNHL	0.12	0.25-0.75	0.20-0.50	0.07-0.15	0.035	0.25-0.55	0.30-0.65	0.65
Q295GQR2	0.12	0.10-0.40	0.20-0.50	0.06-0.12	0.020	0.25-0.45	0.30-0.65	0.25-0.5
Q295GQR3	0.12	0.20-0.40	0.25-0.55	0.06-0.12	0.020	0.25-0.50	—	—
Q345NQR2	0.12	0.25-0.75	0.20-0.50	0.06-0.12	0.020	0.25-0.50	0.3-1.25	0.12-0.65
Q345NQR3	0.12	0.20-0.50	0.25-0.70	0.06-0.12	0.020	0.25-0.50	—	—
Q400NQR1	0.12	0.75	1.10	0.025	0.008	0.25-0.55	0.3-1.25	0.12-0.65
Q450NQR1	0.12	0.75	1.50	0.025	0.008	0.25-0.55	0.3-1.25	0.12-0.65
Q500NQR1	0.12	0.75	2.00	0.025	0.008	0.25-0.55	0.3-1.25	0.12-0.65
Q550NQR1	0.16	0.75	2.00	0.025	0.008	0.25-0.55	0.3-1.25	0.65

Mechanical Properties

Carbon content (wt.%)	Microstructure	Properties	Examples
Low-carbon steel	< 0.25	Ferrite, pearlite	Low hardness and cost. High ductility, toughness, machinability and weldability	AISI 304, ASTM A815, AISI 316L
Medium-carbon steel	0.25 – 0.60	Martensite	Low hardenability, medium strength, ductility and toughness	AISI 409, ASTM A29, SCM435
High-carbon steel	0.60 – 1.25	Pearlite	High hardness, strength, low ductility	AISI 440C, EN 10088-3

Application Areas

New steel materials are used in food processing, chemical, construction, automotive, marine, and medical industries, offering durability, corrosion resistance, and strength.

Stainless Steel in Construction & Building

Stainless steel is a vital material for commercial buildings, bridges, and airports, used in structural frames, roofing, wall cladding, handrails, elevator interiors, and even decorative handicrafts.

Stainless Steel in Automotive Manufacturing

Various grades of stainless steel are used to make car bodies, grilles, exhaust systems, fuel tanks, wheel axles, and bearings, thanks to their rust resistance and durability.

Stainless Steel in Chemical & Oil Industries

Ideal for transporting chemicals and liquids, it’s widely used in pipelines, storage tanks, pumps, and processing vessels in chemical, oil, and gas sectors.

Stainless Steel in Medical Applications

With hygienic and corrosion-resistant properties, it’s essential for medical equipment like operating tables, surgical tools, and sterile processing instruments.

Stainless Steel in Household Appliances

Around 75% of home appliances rely on stainless steel, including ovens, refrigerators, washing machines, kitchen hardware, and TV frames.

Stainless Steel in Furniture & Daily Use

Stainless steel coils and sheets are versatile for daily items: trash cans, benches, tables, bookshelves, advertising displays, and outdoor furniture.

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FAQs

Delivery times vary by product type. For in-stock items, we ship within 5–7 days after receiving the deposit. For standard materials requiring new production, delivery takes 10–15 days. For special or rare materials, it usually takes 20–30 days.

Yes, we provide free samples as requested. You only need to cover the freight cost.

We stand out with professional teams, skilled technicians, competitive pricing, and top-tier after-sales service compared to other steel manufacturers.

Yes. First, we provide a quality certificate for all products. Second, we accept third-party inspections, such as SGS, BV, and CE.

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