GB/T 4237/ GB/T3280 1Cr17/10Cr17 Stainless Steel coils

GB/T 4237 GB/T 3280 1Cr17/10Cr17 Cold Rolled Stainless Steel Coils supplier from BA 2B NO.4 surface.

Gangsteel, a leading Chinese exporter dedicated to delivering top-tier cold-rolled stainless steel sheets and coils, introduces our high-performance GB/T 4237 and GB/T 3280 1Cr17/10Cr17 cold-rolled stainless steel coils. This ferritic stainless steel grade, standardized under China's national specifications—GB/T 4237 for hot-rolled stainless steel plate, sheet, and strip, and GB/T 3280 specifically for cold-rolled variants—features a chromium composition of 16-18%, offering exceptional corrosion resistance, formability, and thermal conductivity without the added cost of nickel. Known as 1Cr17 (modern designation) or 10Cr17 (older variant), this material serves as an affordable alternative to austenitic grades like 0Cr18Ni9 (304), excelling in applications with mild corrosive exposure, magnetic requirements, and elevated temperature demands up to 800°C.

As a nickel-free ferritic alloy, 1Cr17/10Cr17 is magnetic and provides superior oxidation resistance, making it ideal for cost-sensitive industries. Gangsteel's coils are produced in compliance with both standards, though our focus on cold-rolled products aligns primarily with GB/T 3280 for enhanced surface quality and dimensional precision. Exported globally to Europe, North America, Southeast Asia, and the Middle East, these coils undergo stringent quality controls, including third-party inspections, to ensure traceability and performance. This in-depth article explores the material's properties, specifications, equivalents, market pricing, applications, and more, equipping manufacturers and engineers with essential knowledge for informed decisions.

Introduction to GB/T 4237 GB/T 3280 1Cr17/10Cr17

GB/T 4237 and GB/T 3280 are foundational Chinese standards for stainless steel flat products. GB/T 4237 governs hot-rolled stainless steel, emphasizing structural integrity and heat resistance, while GB/T 3280 addresses cold-rolled stainless steel, prioritizing surface finish, thin gauges, and cold workability. Grade 1Cr17/10Cr17 falls under the ferritic category in both, with "1Cr17" indicating approximately 1% carbon (scaled) and 17% chromium, though actual carbon is low (≤0.12%). The "10Cr17" is an earlier nomenclature, often used interchangeably, reflecting slight historical variations in alloying but identical core performance.

This grade's ferritic structure—body-centered cubic—imparts high thermal conductivity (25-28 W/m·K), low thermal expansion (10-11 × 10⁻⁶/°C), and magnetic properties, distinguishing it from non-magnetic austenitics. It resists scaling and oxidation effectively, suitable for intermittent service at 815°C and continuous at 760°C. Low carbon levels prevent carbide formation during welding, minimizing sensitization and intergranular corrosion. Gangsteel's manufacturing leverages advanced Chinese technology, including continuous casting, hot rolling (per GB/T 4237), and subsequent cold rolling/annealing (per GB/T 3280), to produce coils with superior flatness and uniformity. This dual-standard compliance allows flexibility: hot-rolled bases can be further processed into cold-rolled coils for refined applications like appliances and automotive trim.

Key Benefits of 1Cr17/10Cr17 Coils

• Cost Efficiency: Absence of nickel reduces material costs significantly, making it 40-50% cheaper than nickel-alloyed steels while maintaining comparable durability in non-aggressive environments.
• Formability and Ductility: Excellent elongation enables deep drawing and bending, with minimal springback, ideal for complex shapes.
• Corrosion Performance: Forms a stable chromium oxide layer, resisting atmospheric, freshwater, and mild acid attacks; superior to carbon steels in rust prevention.
• Thermal Advantages: High conductivity and low expansion minimize warping in heat-exposed parts, outperforming austenitics in thermal management.
• Magnetic and Weldable: Facilitates magnetic clamping in assembly and supports welding with standard fillers, though preheating is advised for thicker sections.
• Environmental Compliance: Low-alloy design supports recyclability, aligning with China's green steel initiatives and international standards like RoHS.

Gangsteel's coils are customizable, with certifications ensuring adherence to GB standards and export requirements.

Chemical Composition and Mechanical Properties

The chemical and mechanical profiles of 1Cr17/10Cr17 are defined in GB/T 4237 and GB/T 3280, with Gangsteel maintaining tighter controls for premium quality.

Chemical Composition

Per the standards, the composition (weight %) is as follows, optimized for balance:

Chromium drives corrosion resistance, silicon enhances high-temperature stability, and low impurities like phosphorus and sulfur improve surface finish and weld integrity. This formulation mirrors international ferritics, ensuring global compatibility.

Mechanical Properties

In the annealed condition (standard for cold-rolled per GB/T 3280), properties include:

These values support excellent cold forming, with GB/T 4237 hot-rolled variants offering similar but slightly higher strength due to work hardening. Impact toughness remains good at room temperature, and fatigue resistance suits cyclic applications.

Available Specifications and Finishes

Gangsteel's 1Cr17/10Cr17 cold-rolled coils conform to GB/T 3280 tolerances, with options drawing from GB/T 4237 for hybrid processing.

Gangsteel's Type 430 BA coils are available in thicknesses from 0.25 mm to 3.0 mm, widths up to 1500 mm, and coil weights tailored to customer needs. Standard specs include coil IDs 508/610 mm, ODs ≤2000 mm, and weights 3-25 tons. Tolerances: thickness ±0.03 mm (thin), width ±0.5 mm, flatness ≤8 mm/m. Custom services cover slitting (min 20 mm), cut-to-length (up to 6000 mm), and edge options (mill, slit, deburred).

Surface Finishes

Finishes per GB standards include:

• 2B: Cold-rolled, annealed, pickled; matte and smooth (Ra 0.1-0.5 μm) for general use.
• BA: Bright annealed in controlled atmosphere; highly reflective (Ra <0.1 μm) for decorative applications.
• No.4/HL: Polished/brushed for satin aesthetics and scratch resistance.
• Custom: Protective films (PE/PVC) or embossing for specialized needs.

All finishes are inspected via AI systems for uniformity.

Manufacturing Process at Gangsteel

Gangsteel's process for 1Cr17/10Cr17 integrates GB/T 4237 hot-rolling with GB/T 3280 cold-rolling. Starting with EAF/AOD melting for precise alloying, ingots are cast and hot-rolled at 1150-1250°C to coils (per GB/T 4237). Annealing at 780-850°C and pickling remove scale.

Cold rolling reduces thickness by 40-70% per pass on 4-high mills, with inter-annealing to relieve stresses (GB/T 3280). Bright annealing in H2/N2 atmospheres yields BA finishes, followed by temper rolling. Final checks include tensile testing, composition analysis, and non-destructive exams. ISO 9001 certification ensures quality, with exports backed by SGS/BV reports.

Equivalent Materials

1Cr17/10Cr17 corresponds to global ferritic grades, sharing chemistry and properties for easy substitution.

These allow cross-standard use; e.g., replacing EN 1.4016 with 1Cr17 requires no redesign.

Current Market Pricing (as of February 24, 2026)

Prices for GB/T 3280 1Cr17 coils are stable, FOB China Port, CFR basis.

Pricing for BA+PI Finish Coils (Thinner Gauges)

Total: 100 tons; Average: 1249.54 USD/MT.

Pricing for BA+PI Finish Coils (Standard Gauges)

Total: 80 tons; Average: 1237.35 USD/MT.

Pricing for BA Finish Coils with Tolerances (Ultra-Thin)

Total: 80 tons; Value: 107,504.38 USD; Average: 1343.80 USD/MT.

Applications of 1Cr17/10Cr17 Coils

Versatile across sectors:

Appliances and Consumer Goods

Panels for refrigerators, washers; BA finish for shine.

Automotive

Trim, exhaust parts; formability key.

Construction

Cladding, roofing; corrosion resistance.

Industrial

Heat exchangers, belts; thermal properties.

Food Processing

Equipment, counters; hygienic surfaces.

FAQ

What differentiates GB/T 4237 from GB/T 3280 for 1Cr17?

GB/T 4237 is hot-rolled (thicker, stronger), GB/T 3280 cold-rolled (thinner, smoother).

Is 1Cr17 magnetic?

Yes, ferritic structure makes it magnetic.

Best finish for aesthetics?

BA for reflectivity.

Welding tips?

Use low heat, austenitic fillers; anneal post-weld.

Custom options at Gangsteel?

Yes, slitting, coating; MOQ 5 tons.

Price stability?

Stable, but chromium fluctuations affect; quote for accuracy.

Contact Gangsteel for 1Cr17/10Cr17 solutions.