Nickel 200 Pipe Stock ASTM B161

Product Overview

Reviewed and maintained by the Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd.

Nickel 200 Pipe Stock, ASTM B161 | UNS N02200 Seamless, Caustic Service, MTC 3.1

Meta Description: Nickel 200 pipe stock to ASTM B161 / ASME SB-161, UNS N02200, cold-worked seamless, annealed, OD 6-219mm (1/2"-8"), SCH 5S-160, cut-to-length. 99.0% min Ni, caustic/NaOH service below 315°C. PMI + hydrostatic/NDT, EN 10204 3.1.

What ASTM B161 Actually Covers

ASTM B161 (ASME SB-161) is the specification for cold-worked seamless nickel pipe and tube in:

• UNS N02200 — Nickel 200 (C ≤0.15%)
• UNS N02201 — Nickel 201 (C ≤0.02%, low-carbon high-temp grade)

B161 = seamless only. Welded nickel pipe → ASTM B725; condenser/heat-exchanger tube → ASTM B163. We do not label welded as B161 seamless.

Why Nickel 200 — Not Stainless, Not Alloy 625

• Commercially pure nickel, Ni ≥99.0%
• Outstanding resistance to caustic soda (NaOH/KOH) at all concentrations below ~315°C
• High thermal + electrical conductivity (≈2× austenitic stainless)
• Excellent in neutral salts, reducing media, dry fluorine, food-grade alkali lines
• Non-oxidation-acid default; chosen for purity + alkali, not for high strength

Nickel 200 vs Nickel 201 — The Only Real Split Is Carbon

Rule: below 315°C → Nickel 200 (economical default); at/above 315°C hot caustic → Nickel 201. Carbon precipitation as graphite at grain boundaries is the failure mode we design around.

Stock Window (typical ready sizes)

Live stock shifts daily — send OD × wall (or NPS × SCH) + qty, get "in stock / partial / make-to-order" fast.

Mechanical Properties (annealed, B161)

• Tensile strength: ≥380 MPa (55 ksi)
• Yield (0.2%): ≥105 MPa (15 ksi)
• Elongation: ≥35-40%
• Density: 8.89 g/cm³; Melting point: ~1435-1446°C

QC Before Dispatch

1. Heat cert to EN 10204 3.1 (chemistry + tensile from parent heat)
2. PMI/OES grade verification (N02200 ≠ N02201 ≠ alloy 625 — verified, not by colour)
3. Hydrostatic test OR NDT electric test (per PO / B829 general requirements)
4. Flattening / expansion test on tube per spec
5. OD/wall/length gauge + end-face inspection
6. Traceability: heat No. → pipe tag → MTC cross-linked
7. 3.2 (SGS/BV/TÜV) TPI PO-fronted, not back-built

Where It Goes (typical duty)

• Caustic soda evaporators / chlor-alkali cell piping
• NaOH/KOH transfer lines, alkali storage
• Food & pharmaceutical alkali handling (correct finish)
• Heat exchangers, condensers (B163 tube also available)
• Plating rolls, cathode/anode components
• Marine (flowing seawater OK; stagnant foulant zones need design review)

RFQ Template (copy-paste)

Standard: ASTM B161 / ASME SB-161 ___
Grade: N02200 (Nickel 200) / N02201 (Nickel 201) ___
OD: ___mm (or NPS ___)
Wall: ___mm (or SCH ___)
Length: random / fixed ___mm
Condition: annealed / bright annealed / pickled / stress-relieved ___
Ends: plain / bevel / threaded ___
Service: medium ___ + temp ___°C (drives 200 vs 201)
Test: hydrostatic / NDT / both ___
Cert: 3.1 / 3.2 (TPI ___)
Qty: ___ m / ___ pcs
Incoterm: EXW Baoji / FOB Shanghai / DAP / DDP ___

FAQ — Nickel 200 Pipe, ASTM B161

Q1: Is B161 seamless only?
A: Yes. Cold-worked seamless pipe/tube. Welded nickel pipe is ASTM B725; we label correctly, no "seamless" mis-tag.

Q2: 200 or 201 for my line?
A: ≤315°C caustic → 200; ≥315°C or hot alkali evaporator → 201 (low carbon, no graphitization).

Q3: Can it handle HCl / H2SO4?
A: Only at modest concentration + temperature in reducing regime. Strong oxidizers (HNO3, wet chlorine excursion) need alloy review — not a default 200 duty.

Q4: What about stagnant seawater?
A: Flowing seawater fine; stagnant + biofouling → localized attack risk. Design review required.

Q5: SCH40 2" in stock?
A: Common stock size — send PO qty, confirm within hours. Heavy wall / odd NPS quoted to mill lead.

Q6: MTC with small order?
A: EN 10204 3.1 every lot; 3.2 TPI named at PO.

Q7: B161 vs SB-161?
A: Same material, two designation systems (ASTM vs ASME Section II). Both accepted; PO states which.

Q8: Cut-to-length + bevel?
A: Yes — cut, deburr, bevel, end-cap, export pack.

Q9: HS code?
A: Nickel pipe base 7506.20 (verify by destination/Broker); not 8108 fastener code.

Q10: Red lines?
A: No grade substitution, no welded-as-seamless, no cert downgrade, no 200 quoted for >315°C without 201 flag.

Request a Quote

Email: sales@[yourdomain].com

Send OD × wall (or NPS×SCH) + grade + medium/temp + qty. Stock answer fast; dispatch window on heat confirm.

About: Baoji nickel-pipe desk — ASTM B161 / SB-161 Nickel 200 (UNS N02200) seamless pipe from ready stock, annealed, OD 6-219mm, SCH 5S-160, cut-to-length. N02201 (Nickel 201) for >315°C caustic. PMI + hydrostatic/NDT, EN 10204 3.1, 3.2 TPI PO-fronted. No welded-as-seamless, no grade mix, no carbon-confusion between 200/201. Heat No. = tag = MTC.