ASTM 300 Series 2B BA Finish 347 Cold Rolled Stainless Steel Sheet Plate Bending Included

Grade Standard: ASTM certified S34700 / 347 Columbium Stabilized Austenitic Stainless Steel under 300 series specification

Production Process: Precision multi-pass cold rolling, controlled stabilizing annealing, flatness calibration; factory in-house CNC bending service bundled with raw plate supply

Available Surface: Standard industrial 2B mill finish + bright annealed BA finish dual options, other surface treatments negotiable per client requirement

Core Alloy Feature: Niobium(Cb/Columbium) added stabilization design, locks free carbon inside matrix to avoid chromium carbide precipitation; superior anti-intergranular-sensitization performance in continuous 425℃~815℃ sensitizing temperature zone

Differentiated Core Point: Distinct from titanium-stabilized 321, molybdenum anti-corrosion 316/317 family and low-carbon grade 316L/317L, 347 adopts niobium alloying, excels at long-period high-temperature creep resistance and high-pressure thermal circulation condition; bundled one-stop bending processing saves customers independent outsourcing cost

Application Direction: High-pressure boiler accessories, thermal power pipeline fittings, petrochemical high-temperature pressure vessel components, heat exchanger formed parts and high-temperature mechanical structural bending parts

347 cold rolled stainless steel belongs to specialized stabilized heat-resistant stainless steel formulated per strict ASTM industrial norms, positioned as upgraded high-temperature creep-resistant material beyond conventional 321 stabilized steel and all molybdenum-containing anti-corrosion stainless grades. While 321 uses titanium for carbon fixation focusing on regular medium-high temperature alternating environment, 347 replaces titanium with columbium as stabilizing element. Niobium owns stronger combination capacity with free carbon, forms stable niobium carbide to thoroughly suppress grain boundary carbide precipitation, so the material maintains intact metallographic structure under sustained high-temperature load and long-time thermal creep environment, a core property ordinary low-carbon stainless steel cannot realize via single low-carbon composition control. Our products integrate raw sheet sales and supporting CNC bending forming service into one package, different from most steel suppliers only supplying flat steel plate without post-processing; clients receive ready-to-install bent finished parts directly after order, cutting intermediate transport and multi-supplier coordination trouble. All raw materials comply fully with ASTM chemical composition and mechanical property indexes, each batch accompanied with official inspection document for overseas customs clearance and industrial project acceptance.

The biggest competitive edge of ASTM standard 347 stainless steel lies in outstanding high-temperature creep resistance and permanent anti-sensitization brought by niobium stabilization mechanism. When equipment runs under long-term constant high temperature plus continuous pressure load, common stainless steel gradually generates grain boundary embrittlement and structural creep deformation, which eventually triggers component deformation and equipment leakage. Thanks to fixed niobium element locking free carbon, 347 will not produce intergranular corrosion no matter long-term dwell in sensitization temperature range or repeated high-temperature welding assembly; weld zone performance keeps consistent with base metal without post-weld solid solution heat treatment, largely simplifying production flow of high-temperature pressure equipment manufacturers. Compared with 321 titanium-stabilized plate, 347 gains obvious superiority under high-pressure high-temperature creep working condition, especially suitable for thermal power, chemical high-pressure pipeline components with long service cycle requirement.

In production side, whole cold rolling procedure follows ASTM manufacturing specification strictly. Raw alloy slab undergoes incoming chemical inspection at first, then multi-pass precise cold rolling to narrow thickness tolerance range and optimize plate flatness; subsequent sealed atmosphere stabilizing annealing eliminates rolling residual stress and homogenizes internal grain structure, laying reliable base for follow-up bending processing. We provide two mainstream surface choices: cost-efficient matte 2B finish for hidden internal structural parts and high-gloss compact BA bright finish for exposed equipment outer shell and ornamental formed components. BA surface forms under oxygen-free closed annealing without pickling oxidation layer, uniform silvery bright texture reduces pre-install polishing work. The refined cold rolled grain structure effectively improves material bending ductility, avoids cracking, wrinkling and surface peeling during sharp-angle bending and complex arc forming, which is critical for our bundled bending service quality guarantee.

In daily atmospheric and mild industrial waste gas environment, 347 retains standard austenitic stainless steel’s inherent rust-proof capacity, resisting normal air oxidation and weak corrosive flue gas erosion; without high molybdenum addition like 317 series, it is not designed for high-concentration chloride and strong acid immersion, thus cost is more competitive for pure high-temperature thermal equipment projects than heavy anti-corrosion alloy steel.

Different from conventional material suppliers separating plate sales and bending outsourcing, our factory realizes integrated production of raw sheet cutting + numerical control bending + finished packaging. According to customers’ construction drawings and dimensional parameters, professional technical team arranges precision CNC bending machine for various forming types including right-angle bending, multi-fold bending, circular arc bending and irregular special bending. During processing, based on 347’s stable ductility characteristic, we control bending radian and rebound margin accurately to ensure finished bent parts match drawing tolerance without secondary trimming correction.

This bundled service brings prominent practical benefits for downstream manufacturers: clients only need to place one procurement order to get both flat spare plate and pre-bent finished accessories, omitting separate bending factory selection, repeated loading and cross-factory transportation expense; small-batch prototype trial production and large-scale bulk engineering order are both available for customized bending, greatly accelerating clients’ equipment assembly progress. BA bright finished sheets will attach customized anti-scratch PVC film before bending to protect bright surface from machine scratch during forming, ensuring finished bent pieces keep intact original gloss.

2B finished 347 plate after professional bending is widely manufactured into boiler tube support clamp, high-temperature flue baffle, boiler inner positioning frame and thermal power unit pipeline fixed bracket. Long-term high-temperature creep and frequent hot-cold alternation will not cause bent structural deformation or weld corrosion, greatly prolong service life of core boiler auxiliary components.

Bent 347 formed parts serve as pressure tank inner reinforcing frame, high-temperature reaction equipment fixed support and heat exchanger partition component in petrochemical production line. It copes with continuous high-temperature and slight pressure fluctuation environment stably, avoiding structural failure induced by creep fatigue.

BA bright surface bent products are used for waste incinerator outer decorative frame, high-temperature desulfurization equipment enclosure and industrial high-temperature exhaust pipeline outer shielding component. Bright neat appearance satisfies equipment exterior decoration requirement while bearing long-term radiant heat from internal high-temperature flue gas.

Custom irregular bent 347 pieces apply for heat treatment furnace outer casing frame, high-temperature drying equipment fixed structural part and engine heat insulation protection bracket, becoming irreplaceable forming raw material for all kinds of high-temperature mechanical customized parts.

Unprocessed flat sheets are packed with moisture-proof kraft paper and plastic film to prevent damp rust during warehouse storage and long-distance shipment; pre-finished bent parts are separately packaged with soft foam wrapping to avoid corner collision damage. For BA bright finished bent components, tear off surface protective film only after full installation completion to preserve original bright finish.

Daily maintenance work of finished equipment is simple and low-cost: wipe surface dust and floating oil stain with soft cloth plus neutral water-based cleaning agent regularly; stay away from long-time contact with strong acid alkaline liquid on-site. Benefited from niobium stabilized internal structure, even under years of continuous high-temperature operation, internal grain boundary will not produce hidden corrosion defect, cutting periodic overhaul and component replacement cost of industrial projects effectively.

1. Exclusive niobium stabilization formula achieves superior high-temperature creep resistance over titanium-stabilized 321, the core guarantee for high-pressure long-cycle thermal equipment projects;
2. Integrated raw plate supply + bundled CNC bending one-stop service saves clients multiple procurement and processing outsourcing expense, shorten overall production cycle;
3. Dual 2B & BA optional surface meets hidden structural and exposed decorative two kinds of usage demands of different equipment parts;
4. Strict ASTM full-standard production and inspection provide complete mill test certificate, smooth for global import customs clearance and project acceptance check;
5. Precision cold rolling optimizes material ductility, ensures stable bending forming yield and reduces finished product reject rate caused by cracking;
6. Reasonable alloy configuration without redundant high-molybdenum element keeps favorable cost performance for high-temperature dedicated projects vs high-alloy heavy anti-corrosion stainless steel.

We support free sample provision, drawing-based customized bending solution design and targeted bulk wholesale quotation, welcome to send detailed technical parameters for further negotiation.