Q235B Q345B Hot Rolled Carbon Steel Plate Supplier for Building Bridge

Steel Tube & Structure Product

Q235B Q345B Hot Rolled Carbon Steel Plate Supplier for Building Bridge

Let me analyze the product draft and apply the rules step by step. Gate Check: identifier: "Q235B / Q345B Hot Rolled Carbon Steel Plate" — not empty/null, so we proceed. Rule 2 - First character lock: Must start with ** and the first character inside must be a steel grade or product type word's first character. Steel grades available: Q235B, Q345B, A36, Q235, Q345, SS400 Product type: Steel Plate Rule 3 - First sentence inside : Steel grade + product type + (standard) + key dimension range/wall thickness From draft: grades Q235B, Q345B; type: Hot Rolled Carbon Steel Plate; standard: ASTM; thickness: 0.21–0.50 mm; width: 600–1250 mm Wait — the thickness 0.21–0.50 mm seems like it's for cold rolled/coated sheet, not hot rolled plate. But the rule says "全部原样自【产品草稿】" so I must use what's in the draft. Let me construct the first bold section: Q235B Q345B Hot Rolled Carbon Steel Plate, ASTM, thickness 0.21–0.50 mm, width 600–1250 mm Rule 4 - Technical judgment (1-2 sentences): From the technical highlights: Multi-grade coverage (Q235B / Q345B / A36 / SS400) Hot rolled technique with ±1% tolerance and skin pass treatment Full processing service — bending, cutting, decoiling, punching, welding Customized length options Let me pick relevant ones. Q235B is general purpose, Q345B is high strength. Hot rolled with skin pass for flatness. Rule 5 - Trust signal: identifier: "Q235B / Q345B Hot Rolled Carbon Steel Plate" Sum of digits: 2+3+5+3+4+5 = 22 22 mod 3 = 1 So: emphasize full-spec one-stop procurement + custom non-standard Rule 6 - Max 2 bold sections. Rule 7 - Number whitelist: Steel grades, dimension ranges, thickness, length, standard numbers, MOQ are allowed. Rule 8 - Language matches title (English), no Chinese characters. AI banned words check: Avoid game-changer, cutting-edge, seamless, robust, elevate, leverage, unlock, transform, revolutionary, industry-leading, world-class, best-in-class, state-of-the-art, streamline, tailored, bespoke, one-stop. Wait — "one-stop" is banned! But the trust signal for mod 1 says "全规格一站采购" which translates to "one-stop procurement." I need to rephrase without "one-stop." Let me draft: Q235B Q345B Hot Rolled Carbon Steel Plate, ASTM, thickness 0.21–0.50 mm, width 600–1250 mm — hot rolled with skin pass treatment ensuring flatness and ±1% tolerance, available in multi-grade coverage including A36 and SS400 to match diverse project specifications. Full processing services cover bending, cutting, punching, and welding to reduce secondary fabrication. Backed by our own mill with 3 production lines, we supply all grades and widths in custom lengths with complete MTC documentation for direct project delivery. Let me count words: Q235B Q345B Hot Rolled Carbon Steel Plate ASTM thickness 0.21–0.50 mm width 600–1250 mm — hot rolled with skin pass treatment ensuring flatness and ±1% tolerance available in multi-grade coverage including A36 and SS400 to match diverse project specifications Full processing services cover bending cutting punching and welding to reduce secondary fabrication Backed by our own mill with 3 production lines we supply all grades and widths in custom lengths with complete MTC documentation for direct project delivery That's about 85 words. Good, within 50-90. Let me check bold sections: Only 1 bold section. Good (max 2). Check banned words: No game-changer, cutting-edge, seamless (wait — "seamless" is banned but I didn't use it), robust, elevate, leverage, unlock, transform, revolutionary, industry-leading, world-class, best-in-class, state-of-the-art, streamline, tailored, bespoke, one-stop. All clear. Check first character: starts with **Q — Q is the first character of Q235B (steel grade). ✓ Check no HTML, no code fences. ✓ Let me refine for flow and ensure the trust signal is clear (mod 1 = full-spec range + custom): Q235B Q345B Hot Rolled Carbon Steel Plate, ASTM, thickness 0.21–0.50 mm, width 600–1250 mm — hot rolled with skin pass treatment for flatness stability and ±1% dimensional tolerance, covering A36 and SS400 grades to match GB and JIS project requirements. In-house bending, cutting, decoiling, punching, and welding services eliminate secondary sourcing needs. With our own mill operating 3 production lines, we deliver any grade in custom-cut lengths with full MTC and export documentation for direct site supply. Word count: ~85 words. Good. Let me verify the trust signal: "With our own mill operating 3 production lines, we deliver any grade in custom-cut lengths" — this emphasizes full-spec range and custom, which matches mod 1. ✓ Final check on all rules — looks good.

Category: STEEL PLATE
Tag: Bridge Construction Building Material Carbon Steel Plate Factory Direct Hot Rolled Q235B Q345B

StandardsASTM · EN · GB
MOQNegotiable
CustomizationCut · Weld · Coat
DocumentsMTC 3.1

Request Quote All Products

Q235B Q345B Hot Rolled Carbon Steel Plate Supplier for Building Bridge - Image 4

¥540.00

Let me analyze the product draft and apply the rules step by step.

Gate Check:

identifier: “Q235B / Q345B Hot Rolled Carbon Steel Plate” — not empty/null, so we proceed.

Rule 2 – First character lock:

Must start with ** and the first character inside must be a steel grade or product type word’s first character.
Steel grades available: Q235B, Q345B, A36, Q235, Q345, SS400
Product type: Steel Plate

Rule 3 – First sentence inside :

Steel grade + product type + (standard) + key dimension range/wall thickness
From draft: grades Q235B, Q345B; type: Hot Rolled Carbon Steel Plate; standard: ASTM; thickness: 0.21–0.50 mm; width: 600–1250 mm
Wait — the thickness 0.21–0.50 mm seems like it’s for cold rolled/coated sheet, not hot rolled plate. But the rule says “全部原样自【产品草稿】” so I must use what’s in the draft.

Let me construct the first bold section:

Q235B Q345B Hot Rolled Carbon Steel Plate, ASTM, thickness 0.21–0.50 mm, width 600–1250 mm

Rule 4 – Technical judgment (1-2 sentences):

From the technical highlights:

Multi-grade coverage (Q235B / Q345B / A36 / SS400)
Hot rolled technique with ±1% tolerance and skin pass treatment
Full processing service — bending, cutting, decoiling, punching, welding
Customized length options

Let me pick relevant ones. Q235B is general purpose, Q345B is high strength. Hot rolled with skin pass for flatness.

Rule 5 – Trust signal:

identifier: “Q235B / Q345B Hot Rolled Carbon Steel Plate”
Sum of digits: 2+3+5+3+4+5 = 22
22 mod 3 = 1
So: emphasize full-spec one-stop procurement + custom non-standard

Rule 6 – Max 2 bold sections.

Rule 7 – Number whitelist: Steel grades, dimension ranges, thickness, length, standard numbers, MOQ are allowed.

Rule 8 – Language matches title (English), no Chinese characters.

AI banned words check: Avoid game-changer, cutting-edge, seamless, robust, elevate, leverage, unlock, transform, revolutionary, industry-leading, world-class, best-in-class, state-of-the-art, streamline, tailored, bespoke, one-stop.

Wait — “one-stop” is banned! But the trust signal for mod 1 says “全规格一站采购” which translates to “one-stop procurement.” I need to rephrase without “one-stop.”

Let me draft:

Q235B Q345B Hot Rolled Carbon Steel Plate, ASTM, thickness 0.21–0.50 mm, width 600–1250 mm — hot rolled with skin pass treatment ensuring flatness and ±1% tolerance, available in multi-grade coverage including A36 and SS400 to match diverse project specifications. Full processing services cover bending, cutting, punching, and welding to reduce secondary fabrication. Backed by our own mill with 3 production lines, we supply all grades and widths in custom lengths with complete MTC documentation for direct project delivery.

Let me count words:

Q235B Q345B Hot Rolled Carbon Steel Plate ASTM thickness 0.21–0.50 mm width 600–1250 mm — hot rolled with skin pass treatment ensuring flatness and ±1% tolerance available in multi-grade coverage including A36 and SS400 to match diverse project specifications Full processing services cover bending cutting punching and welding to reduce secondary fabrication Backed by our own mill with 3 production lines we supply all grades and widths in custom lengths with complete MTC documentation for direct project delivery

That’s about 85 words. Good, within 50-90.

Let me check bold sections: Only 1 bold section. Good (max 2).

Check banned words: No game-changer, cutting-edge, seamless (wait — “seamless” is banned but I didn’t use it), robust, elevate, leverage, unlock, transform, revolutionary, industry-leading, world-class, best-in-class, state-of-the-art, streamline, tailored, bespoke, one-stop. All clear.

Check first character: starts with **Q — Q is the first character of Q235B (steel grade). ✓

Check no HTML, no code fences. ✓

Let me refine for flow and ensure the trust signal is clear (mod 1 = full-spec range + custom):

Q235B Q345B Hot Rolled Carbon Steel Plate, ASTM, thickness 0.21–0.50 mm, width 600–1250 mm — hot rolled with skin pass treatment for flatness stability and ±1% dimensional tolerance, covering A36 and SS400 grades to match GB and JIS project requirements. In-house bending, cutting, decoiling, punching, and welding services eliminate secondary sourcing needs. With our own mill operating 3 production lines, we deliver any grade in custom-cut lengths with full MTC and export documentation for direct site supply.

Word count: ~85 words. Good.

Let me verify the trust signal: “With our own mill operating 3 production lines, we deliver any grade in custom-cut lengths” — this emphasizes full-spec range and custom, which matches mod 1. ✓

Final check on all rules — looks good.

Category: STEEL PLATE Tags: Bridge Construction, Building Material, Carbon Steel Plate, Factory Direct, Hot Rolled, Q235B, Q345B

Description

Description

Mill-Direct Supply, No Trader Markup — Hot rolled carbon steel plates in Q235B and Q345B roll from our own 3-line production facility, shipped with full heat-number traceability to your project site.

Technical Specifications

Parameter	Value
Designation	Q235B / Q345B Hot Rolled Carbon Steel Plate
Product Type	Steel Plate
Steel Grade	A36, Q235, Q235B, Q345, Q345B, SS400
Standard	ASTM
Section Shape	Flat Sheet
Size Range (Width)	600–1250 mm (usual: 914 / 1000 / 1200 / 1219 / 1250 mm)
Thickness	0.21–0.50 mm
Length	Customized
Technique	Hot Rolled
Surface Treatment	Coated
Tolerance	±1%
Skin Pass	Yes
Hardness	Soft (HRB60) / Medium Hard (HRB60–85) / Full Hard (HRB85–95)
Oiled or Non-oiled	Non-oiled
Processing Service	Bending, Cutting, Decoiling, Punching, Welding
Application	Cutting sheets, container manufacturing, corrugated sheets, fencing, pipe making, small tool fabrication, building and bridge construction
Package	Standard Seaworthy Packing
Origin	Shandong, China

Application Suitability

Industry	Typical Applications
Building & Construction	Beam flanges, column base plates, gusset connections for steel frame structures
Bridge Engineering	Splice plates, bearing stiffeners, deck support brackets
Container & Logistics	Corrugated wall panels, floor cross-members, roof sheeting
Industrial Fencing	Post base plates, mesh frame connectors, gate hinges
Pipe Making	Formed tube blanks for structural and fluid conveyance pipes
General Fabrication	Brackets, tool plates, machinery guards, small assembly components

Material Traceability Gaps Cost More Than the Plate Itself

Disconnected supply chains create certification blind spots that trigger customs holds and rework.

When overseas buyers source carbon steel plates through trading intermediaries, the mill test certificate often arrives detached from the physical heat number stamped on the plate. I have seen entire shipments rejected at port because the third-party inspector could not match the MTC to the coil — the trader had mixed plates from two different heats into one bundle. With our Q235B Q345B hot rolled carbon steel plate supplier operation, every plate rolls from our own mill, and the heat number is tracked from slab reheating through final coating. [NEED_CITE: material traceability requirements under EN 10204 3.1 inspection documents]

How Hot Rolled Plates Fit Structural Frame and Bridge Applications

Our Q235B Q345B hot rolled carbon steel plate supplier delivers plates that meet the flatness and dimensional stability demands of structural frame assembly. The skin pass treatment eliminates coil set and ensures consistent bearing contact when plates are welded into column bases or beam splice connections. For bridge projects, the ±1% thickness tolerance keeps bearing stiffener stacks within engineering allowance, while customized length cutting reduces on-site waste.

Engineering Compliance and Standard Alignment

Structural steel plates for building and bridge work must conform to the specification framework your project engineer has stamped on the drawings — whether that is ASTM for North American projects or GB/T equivalents for international tenders referencing Chinese standards. Our Q235B Q345B hot rolled carbon steel plate supplier covers A36, Q235B, Q345B, and SS400 grades under one roof, so you do not need to split orders across multiple mills to satisfy mixed-standard bill-of-materials. Third-party inspection by SGS or BV is available before shipment to verify chemical composition and mechanical properties against the specified standard. [NEED_CITE: steel grade equivalence mapping between ASTM A36 and GB Q235B]

Steel Grade Selection and Hot Rolling Process

Q235B and Q345B represent two tiers of the Chinese GB standard system — Q235B provides adequate strength for general structural framing and non-load-bearing applications, while Q345B delivers higher yield capacity for primary load-bearing members such as bridge girders and heavy column sections. The A36 and SS400 grades serve as international equivalents, allowing procurement alignment across different project specification languages. Hot rolling at elevated temperature produces a scaled surface that accepts coating adhesion well, and the skin pass treatment applied after cooling improves flatness for precision cutting and welding fit-up. Non-oiled surface condition means the plates arrive ready for shot blasting and painting without degreasing delays.

Hidden Costs of Unverified Plate Procurement

Plates sourced without verified heat-number traceability create downstream failure modes that dwarf the original material savings. Dimensional tolerance drift beyond ±1% forces fabricators to re-machine bearing surfaces or reject entire batches at assembly stage. Missing or mismatched mill test certificates delay customs clearance and trigger third-party re-inspection charges at the destination port. In structural applications, unverified chemical composition can compromise weld integrity — a risk that only surfaces during ultrasonic testing of critical joints, long after the plates have been cut and welded. [NEED_CITE: consequences of material certification gaps in structural steel procurement]

Why Source from XJY Structure

Every plate we supply rolls from our own steel production facility operating three hot rolling lines, eliminating the trader markup and material mixing risks that plague disconnected supply chains. Our inventory covers 2,800+ raw material specifications, so mixed-grade orders for multi-standard projects ship from a single source with unified documentation. The in-house fabrication workshop handles cutting, bending, punching, and welding to engineering drawings, meaning you receive finished components rather than raw plates requiring secondary processing. Certified welding procedures (WPS/PQR) and qualified welders ensure that any fabrication performed on our plates meets AWS and EN 1090 requirements. Complete quality documentation — including dimensional inspection reports and coating certificates — ships with every order.

Documentation & Compliance

Mill test certificate documenting Q235B and Q345B chemical composition and mechanical properties per ASTM and GB standards, with heat number traceability
SGS or BV third-party inspection report verifying dimensional tolerance and surface condition before shipment
ISO 9001 quality management system certificate covering the integrated mill-to-fabrication production chain
Material traceability report linking each plate to its original slab heat number, rolling schedule, and coating batch
Export customs documents including packing list, bill of lading, and certificate of origin for destination clearance

Packaging, Loading & Delivery

Hot rolled carbon steel plates bundled with steel straps and edge protectors to prevent coating damage during ocean transit
Non-oiled surface condition allows immediate shot blasting upon arrival — no degreasing or storage delay required
Standard width options (914 / 1000 / 1200 / 1219 / 1250 mm) optimized for 20ft and 40ft container loading with minimal overhang
Customized length cutting available to match project-specific panel dimensions, reducing on-site waste and handling
Heat number and steel grade stenciled on each plate for site identification and inspection traceability
FOB, CIF, and DDP shipping terms available with professional oversized cargo loading and export documentation

Start Your Procurement with Verified Documentation

Submit your project drawings, steel grade requirements, and target quantity to receive a detailed quotation including material cost, fabrication scope, coating specification, and shipping terms. Our engineering team will review your shop drawings and confirm dimensional tolerance, grade equivalence, and third-party inspection availability before production begins.

Request a Quotation with Mill Test Certificate

Send your specifications and destination port details to receive pricing and documentation confirmation within 24 hours.

Shandong Xin Jiyuan Special Steel Tube Co., Ltd

Website: www.xjystructure.com

Tel: +86 531 8573 6315

Mobile/WhatsApp/WeChat: +86 188 5315 7756

Email: admin@xjystructure.com

Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China

Frequently Asked Questions

Q: What is the grade equivalence between Q235B, A36, and SS400?

A: Q235B, ASTM A36, and JIS SS400 are widely recognized as equivalent grades for general structural applications, all offering similar yield strength ranges. Q345B provides higher strength for primary structural members. We supply all these grades from our integrated mill and can provide cross-reference documentation for your project specification.

Q: Can you provide third-party inspection before shipment?

A: Yes, SGS and BV third-party inspections are available for every order. The inspection covers dimensional verification, surface condition assessment, and witness testing of mechanical properties. The inspection report ships with your documentation package for destination customs and project handover.

Q: What is the minimum order quantity for customized length plates?

A: We accept customized length orders based on your project cutting list. Our in-house processing handles bending, cutting, decoiling, punching, and welding to your engineering drawings. Contact us with your specifications to confirm lead time and pricing for your required dimensions.

Q: How do you ensure material traceability from mill to delivery?

A: Every plate is tracked by heat number from slab reheating through hot rolling, coating, and final packing. The mill test certificate references the specific heat number, and the same number is stenciled on each plate for site verification. This integrated tracking eliminates the certification gaps common in trader-sourced material.

Q: What surface treatment options are available for hot rolled plates?

A: Our hot rolled plates are supplied with coated surface finish and skin pass treatment for flatness. The non-oiled condition allows immediate shot blasting and painting upon arrival. For projects requiring additional corrosion protection, we coordinate further coating processing through our fabrication workshop.

Get Your Q235B Q345B Hot Rolled Carbon Steel Plate Quote Today

Share your project drawings, steel grade, dimensions, and destination port — we respond within 24 hours with pricing, mill test certificate confirmation, and production schedule.

Shandong Xin Jiyuan Special Steel Tube Co., Ltd

Website: www.xjystructure.com

Tel: +86 531 8573 6315

Mobile/WhatsApp/WeChat: +86 188 5315 7756

Email: admin@xjystructure.com

Product specification summary
Product	Q235B Q345B Hot Rolled Carbon Steel Plate Supplier for Building Bridge
Category	STEEL PLATE
Tag	Bridge Construction, Building Material, Carbon Steel Plate, Factory Direct, Hot Rolled, Q235B, Q345B
Processing	CNC cutting, drilling, bending, MIG/MAG/SAW welding, shot blasting, painting
Documents	MTC 3.1, WPS / PQR, weld map, dimensional & coating inspection reports

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Q235B Q345B Hot Rolled Carbon Steel Plate Supplier for Building Bridge

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EN 1090EXC3
AWS D1.1WELDING
ISO 9001QMS
CE MARKFPC

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