Gr2 Titanium Heat Exchanger Stock for Chemical Plant

Product Overview

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

Gr2 Titanium Heat Exchanger Stock for Chemical Plant | ASTM B338 R50400, Annealed, MTC 3.1

Meta Description: Gr2 (R50400) titanium heat exchanger tube stock for chemical plants — ASTM B338 seamless/welded, fully annealed, cut-to-length, PMI per heat, EN 10204 3.1, heat-number traceable after cutting. Oxidizing chloride / seawater / wet-Cl₂ / brine pre-heat. Gr7/Gr12 upgrade above crevice threshold.

Chemical Plant Stock Is Not "Whatever Is on the Shelf"

A real chemical-plant Gr2 stock program answers three questions before price:

1. Is it dead-soft annealed? Elongation ≥20%, no cold-hard tube masquerading as "stock" — hard Gr2 micro-cracks during roll-expand and U-bend.
2. Is the heat number intact after cutting? Cut-to-length must carry parent heat via marking transfer, not a generic "Gr2" tag.
3. Is Gr2 actually right for the segment? Gr2 wins oxidizing chloride; it does NOT win hot crevices >80°C, reducing acid, dry Cl₂, or fluoride service.

Fast dispatch only matters if the tube survives hydraulic expansion on Monday morning. Stock without traceability is just shiny metal.

Where Gr2 Is the Correct Call

Where Gr2 Must Step Aside (write this on the PO)

• >80°C stagnant crevice / boiling concentrated brine → Gr7 (Ti-0.2Pd) or Gr12
• Reducing acid (HCl/H₂SO₄ wash, deaerated) → Gr7/Gr12, not Gr2
• Dry chlorine (<0.5% H₂O) → titanium unsafe; separate alloy review
• HF / free fluoride → titanium excluded; Zr/C-276/PTFE-lined review
• High-pressure thin-wall U-bundle → Gr9; high-temp brine strength → Gr12

Gr2 is the right answer for most oxidizing chloride duty — but "most" is not "all". A stock supplier who never asks your temperature and crevice condition is not helping you.

Stock Window (typical, confirm per inquiry)

Stock confirm within 4 business hours with OD×wall + length + qty.

Why "Dead-Soft Anneal" Is Non-Negotiable

• Cold-hard Gr2 looks identical, rolls poorly, cracks at tubesheet expansion
• Proper vacuum anneal → elongation ≥20%, O≤0.25%, Fe≤0.30% (B338 limits)
• U-bend to 1.5×OD feasible only with true annealed ductility
• Outsourced poor-vacuum anneal leaves brittle oxygen skin → leaks after 3 weeks, not 3 years

QC Per Lot (stock or cut)

1. ASTM B338 MTC EN 10204 3.1 — heat chemistry + tensile + flatten/flare (seamless) or reverse-flatten (welded)
2. 100% eddy current (ET) or UT per B338 election — stated on PO, not "assumed"
3. Hydrostatic per agreed pressure; helium leak test on request
4. PMI on tube body — R50400 verified, not tag-trust
5. Heat No. = end stamp = MTC; cut pieces keep parent heat by transfer map
6. Surface Fe-free check; no carbon-steel contact in storage
7. 3.2 (SGS/BV/TÜV) TPI PO-fronted for PED/offshore/turnaround-critical

Turnaround / Maintenance Use Case

• Emergency re-tube: stock OD/wall dispatched fast, cut to bundle length
• Spare tube reserve for scheduled shutdown
• U-bend duplicate from old bundle drawing
• Mix Gr2 stock + Gr7 upgrade section in one bundle (written justification)

Hard Boundaries (no overclaim)

• Gr2 crevice safe ≈ ≤80°C aerated chloride; above that → Gr7/Gr12
• No HF / free fluoride on titanium surface
• Dry Cl₂ excluded — moisture required for passive film
• 3.1 = mill QA sign; 3.2 = PO-fronted TPI, never back-issued
• Recycled-billet / non-VAR melt without heat MTC → rejected internally
• Annealing cert ≠ annealing reality; we anneal in-house vacuum, not broker it

RFQ Template (copy-paste)

Fluid (tube side): ___
Cl⁻ ___ppm, pH ___, fluoride/HF: Y/N ___
Max tube-wall temp: ___°C   (crevice/stagnant? Y/N)
Aerated / oxidizing or deaerated / reducing: ___
ASTM B338 Gr2, OD×wall ___mm
Length: straight ___m / cut-to-length ___mm / U-bend DWG ___
Seamless / welded-annealed: ___
NDE: ET / UT / hydro / helium ___
Cert: 3.1 / 3.2 TPI (SGS/BV/TÜV ___)
Use: new bundle / re-tube / spare reserve ___
Incoterm: EXW / FOB / CIF / DAP ___

FAQ — Gr2 Titanium Heat Exchanger Stock

Q1: How fast can stock ship?
A: Common OD/wall from inventory confirmed within 4h; cut-to-length dispatched in days. Custom wall or U-bend gets a firm slot — no fake "24h" on non-stock sizes.

Q2: How do I know the tube is truly annealed?
A: MTC tensile (elongation ≥20%) + vacuum-anneal record + U-bend PT. Hard tube fails flare/roll — we do not ship it.

Q3: Is Gr2 enough for my brine evaporator?
A: Aerated, ≤80°C crevice → yes. Boiling concentrated brine with stagnant gaps → Gr7. Reducing acid wash → Gr7/Gr12.

Q4: Cut pieces still traceable?
A: Yes. Parent heat number transferred to every cut piece; MTC + sub-tag map in dispatch dossier.

Q5: Seamless or welded stock?
A: Both B338-valid. Welded-annealed cost-effective for most bundles; seamless for high-vibration/high-pressure. PO states which.

Q6: Can Gr2 touch wet chlorine?
A: Yes — wet Cl₂ (with moisture) is a classic Gr2 duty. Dry Cl₂ (<0.5% H₂O) is excluded.

Q7: HF in cleaning CIP?
A: No. Any fluoride/HF contacts titanium surface → material review with alternative alloy.

Q8: What does "3.1 MTC" prove?
A: Heat-specific chemistry, tensile, NDE result, QA-independent signature, heat number cross-link. Not a generic grade letter.

Q9: HS code?
A: Titanium tube common heading differs from finished exchanger — Broker confirms by destination/form.

Q10: Biggest maintenance-buy mistake?
A: Buying "Gr2 stock" by price, no heat number, no anneal record, no crevice temp on PO. Re-tube leaks in week 3 — and the cheapest tube becomes the most expensive tube.

Request a Quote

Email: sales@[yourdomain].com

Send OD×wall + length + fluid + max temp + crevice condition + cert level. We confirm stock grade-fit, not just availability.

About: Baoji Gr2 titanium heat-exchanger tube stock for chemical plants — ASTM B338 R50400, fully vacuum-annealed, seamless/welded, cut-to-length and U-bend. PMI per heat, EN 10204 3.1, heat-number transfer on cut pieces. Grade-fit checked against crevice temp and oxidation state; Gr7/Gr12 upgrade advised where Gr2 reaches its limit. No recycled-billet substitution, no broken heat chain, no "stock-first, chemistry-later". Heat No. = stamp = MTC.