​ Nickel Bar for Thermal Processing Equipment

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Проверено и поддерживается инженерной командой Shaanxi Qianyi Tuoda Technology Co., Ltd.

Nickel Bar for Thermal Processing Equipment | ASTM B160 N02200 / N02201, Furnace Fixture Stock, 315°C Grade Rule

Meta Description: Pure nickel bar (ASTM B160) for thermal processing equipment — Nickel 200 for ≤315°C, Nickel 201 (N02201, C≤0.02%) for sustained >315°C furnace fixtures, muffle supports, trays, agitator shafts. PMI per heat, EN 10204 3.1.

One Rule Before Everything Else: Temperature Picks the Grade

• ≤315°C (600°F): Nickel 200 / UNS N02200 — economical, same corrosion profile
• >315°C sustained: Nickel 201 / UNS N02201 — carbon capped 0.02%, no grain-boundary graphite precipitation
• Graphitization is silent: above 315°C, 200's carbon precipitates as graphite at grain boundaries → ductility collapses, part looks fine until it cracks under load
• 201 does not "add strength" — it removes the failure mechanism. That is why furnace people spec it.

Standard & Form

• Spec: ASTM B160 / ASME SB-160 (Rod and Bar — not B161/B163, those are tube specs)
• UNS: N02200 (200) / N02201 (201)
• Forms: round bar, square bar, hex bar, flat bar, forged block, peeled/bright-drawn bar
• Condition: annealed (default for thermal duty) / hot-rolled black / cold-drawn / stress-relieved

Stock Window (typical)

Stock confirm within 4 business hours with diameter + grade + qty.

Chemistry Gate (the only thing that separates 200 from 201)

If MTC carbon >0.02% → it is not 201. No tag wording overrides the heat analysis.

Mechanical (annealed, typical)

• Tensile: ≥345-380 MPa (bar size dependent per B160)
• Yield (0.2%): ≥83-105 MPa
• Elongation: ≥35% (small dia), ≥30% (large section)
• Density: 8.89 g/cm³; Thermal conductivity ~70 W/m·K
• CTE ~13.3 µm/m·°C — size thermal growth into fits
• Continuous service ceiling: 200 ≈315°C; 201 ≈600°C (oxidation becomes limiting above ~600°C in air)

Where These Bars Actually Go

• Furnace muffle supports, radiant-tube hangers
• Heat-treat trays, baskets, fixture rails, conveyor rider bars
• Agitator / mixer shafts in hot caustic reactors
• Valve stems, pump shafts for hot alkali service
• High-temp fastener stock (bolts/studs/nuts) for evaporator flanges
• Vacuum-furnace conductive shafts, non-magnetic fixture parts
• Caustic evaporator internals operating 315-500°C

Machining Reality (shop-floor note)

• Nickel work-hardens fast — sharp positive-rake tools, heavy feed, low speed, flood coolant
• Cut below the work-hardened layer each pass
• Annealed bar machines closer to 316SS, not carbon steel
• Bright-peeled OD saves rough-turn time on CNC

QC Before Dispatch

1. Heat cert EN 10204 3.1 — carbon verified (≤0.02% for 201)
2. PMI/OES per lot — N02201 ≠ N02200 ≠ Alloy 400
3. Diameter / straightness / length gauge full length
4. UT on heavy forged block on request
5. Heat No. = tag = MTC cross-link
6. 3.2 (SGS/BV/TÜV) TPI PO-fronted, never back-built
7. Export pack: VCI wrap + ISPM-15 crate + heat-number label

Real Boundaries (no overclaim)

• Not a superalloy — above ~600°C continuous, oxidation (not strength) is the limiter
• High-temp sulfur / low-melt sulfide atmosphere → excluded
• Strong oxidizers (conc. HNO₃, wet Cl₂) → alloy review, not default nickel
• 201 is chosen for temperature + ductility retention, not for higher tensile

RFQ Template (copy-paste)

Standard: ASTM B160 / SB-160 ___
Grade: N02200 (≤315°C) / N02201 (>315°C) ___
Form: round / square / hex / flat / forged block ___
Diameter or section: ___mm
Length: ___mm (or per attached DWG)
Condition: annealed / hot-rolled / cold-drawn / peeled bright ___
Operating temp: ___°C (drives 200 vs 201)
Atmosphere: air / reducing / caustic vapor / inert ___
Machining: rough-turn allowance ___mm / finish-ground / as-bar ___
Cert: 3.1 / 3.2 (TPI ___)
Qty: ___ pcs / ___ kg
Incoterm: EXW Baoji / FOB Shanghai / DAP / CIF ___

FAQ — Nickel Bar for Thermal Processing

Q1: Why not just buy Nickel 200 for the furnace?
A: Below 315°C it is fine and cheaper. Above 315°C sustained, 200 graphite-embrittles — invisible until fracture. 201 costs a little more, removes the failure mode.

Q2: Is 201 "stronger" than 200?
A: Marginally lower tensile. Its value is ductility retention after long high-temp dwell, not higher strength.

Q3: Can you supply forged block / flat bar for fixtures?
A: Yes — round, flat, square, hex, forged block, all to ASTM B160, annealed default.

Q4: How do I prove it's really 201?
A: MTC carbon ≤0.02% + PMI/OES lot check. Carbon >0.02% = not N02201.

Q5: Welding filler for machined parts?
A: ERNi-1 / ENi-1; WPS per ASME IX F-No.41. No stainless filler.

Q6: Thermal growth allowance?
A: CTE ~13.3 µm/m·°C — a 1m bar grows ~4mm over 300K rise; fixture clearances sized accordingly.

Q7: Bright bar vs black bar?
A: Black = furnace-scale surface, structural; bright-peeled = machined finish, less shop cleanup.

Q8: Small maint qty OK?
A: Yes — short lengths / remnant packs handled, not ton-only.

Q9: HS code?
A: Nickel bar base 7505.20 band — Broker confirms by destination (not tube/plate code).

Q10: Biggest spec mistake?
A: Drawing says "pure nickel bar" with no UNS and no temp — shop ships 200, furnace runs at 420°C, fixture cracks in 6 months. Always write N02201 + >315°C on the PO.

Request a Quote

Email: sales@[yourdomain].com

Send section size + length + operating temp + atmosphere + qty. Grade recommended on the quote — temperature decides, not price.

About: Baoji pure-nickel bar desk — ASTM B160 / SB-160, N02200 (≤315°C) and N02201 (>315°C, C≤0.02%) round/square/hex/flat/forged block for furnace fixtures, muffle supports, trays, agitator shafts. Annealed default, PMI per heat, EN 10204 3.1, 3.2 TPI PO-fronted. No grade swap, no carbon fudge, heat No. = tag = MTC.