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CasaProdottiValvole a globoPN16 321 Globe Valve,DN65,RF End

PN16 321 Globe Valve,DN65,RF End

PN16 321 Globe Valve,DN65,RF End

China 321 Globe Valve Factory ,DIN 3356 321 Globe Valve,DN65 321 Globe Valve,PN65 321 Globe Valve.

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321 Globe Valve

321 Globe Valve is a globe valve made of 321 stainless steel (UNS S32100 / EN 1.4541 / ASTM A351 CF8C / A182 F321) — a titanium‑stabilized austenitic stainless steel, designed for high‑temperature service, anti‑sensitization, and general corrosion resistance.

Material: 321 Stainless Steel

  • Standard: GB/T 1220, ASTM A240 / A351 / A182, EN 10088‑1
  • Composition: Cr 17–19%, Ni 9–12%, Ti ≥ 5×C% (key addition)
  • Core Properties:

    High‑temperature stability: Usable from ‑196°C to +550°C, short‑term up to 815°C

    Anti‑intergranular corrosion: Titanium binds carbon → no chromium carbide precipitation; no sensitization after welding or heat exposure — biggest advantage over 304/304L

    Corrosion resistance: Good in atmosphere, water, steam, weak acids, organic chemicals; similar to 304 in general media

    Mechanics: Tensile ≥ 515 MPa, Yield ≥ 205 MPa; good ductility & weldability

  • Limitazioni: ❌ Poor chloride resistance → avoid seawater, brine, salt solutions; ❌ not for strong reducing acids (HCl, dilute H₂SO₄)

Full Specifications

Basic Data

  • Model: J41W‑PN16/25/40/64‑321 (flanged globe valve)
  • Pressure: PN16 – PN64 / Class 150 – Class 600
  • Size: DN15 – DN600 (½″ – 24″)
  • Standards: GB/T 12235, ASME B16.34, API 603, BS 1873
  • Ends: Flanged (RF/RTJ), Butt‑weld, Socket‑weld, Threaded
  • Face‑to‑Face: GB/T 12221, ASME B16.10
  • Test: GB/T 13927, API 598

 Standard Material BOM

Part Materiale Note
Body / Bonnet 321 / F321 / CF8C Cast or forged
Disc / Seat / Stem 321 or 13Cr / Stellite hardfacing For wear & erosion
Gasket Graphite + 321 / PTFE High temp: graphite
Packing PTFE / Expanded Graphite ≤200°C: PTFE; >200°C: graphite
Fasteners 321 / 304 / Alloy A286 High‑temp use: A286

Key Advantages

  1. Best for High‑Temp + Welded Systems:
    • No intergranular corrosion after welding or long service at 400–550°C → far better than 304/316
    • Ideal for steam, superheated steam, hot oil, heat transfer systems, furnace lines
  2. Reliable General Corrosion:
    • Excellent in water, steam, air, neutral chemicals, food, petroleum, refinery, and petrochemical processes
  3. Easy Fabrication: Excellent weldability, no post‑weld heat treatment needed
  4. Good Throttling: Globe valve design = precise flow control, tight shut‑off

 Typical Applications

  • Power & Energy: Steam lines, boilers, turbine systems, heat networks
  • Petrochemical: Refineries, ethylene plants, high‑temperature process lines
  • Chemical: Organic acids, alcohols, solvents, high‑temperature neutral media
  • Heating & HVAC: Hot oil, thermal fluid, high‑pressure hot water
  • Industrial Furnaces: High‑temperature gas & air lines
  • NOT FOR: Seawater, brine, chlorides, HCl, sulfuric acid
Comparison: 321 vs 304 / 316 / TA2
Condition Choice Reason
High temp (400–550°C) + welded 321 304/316 will fail by intergranular corrosion
General corrosion, <300°C 304 / 316 Cheaper, similar performance
Seawater / brine TA2 321 will pit & corrode rapidly
Strong acids 316L / Alloy C4 321 not suitable
High‑temp + chloride Inconel 625 / Hastelloy 321 cannot resist
Rule:

Choose 321 = high temperature + welding + no chlorides

 Installation & Operation Rules

  1. Flow direction: Standard — flow under disc
  2. Temperature: Max continuous ≤ 550°C; above this strength drops sharply
  3. Welding: Use ER321 / ER347 filler; no post‑weld heat treatment required
  4. Avoid chloride contamination: No salt, brine, or bleach service — causes pitting
  5. Galvanic: Compatible with other stainless steels; no special isolation needed

 FAQ: 321 Globe Valve

Q1: Why choose 321 instead of 304?
A: Only 321 stays corrosion‑resistant after welding or heating to 400–550°C. 304 becomes sensitive and corrodes fast.
Q2: Can it be used for steam?
A: Excellent choice — standard material for high‑temperature steam valves worldwide.
Q3: How does it compare to 316?
A: 316 better for chemical corrosion; 321 far better for high‑temperature welded service.
Q4: Is it expensive?
A: ~1.2× 304, ~0.9× 316 — very cost‑effective for its specific strength.
Final Selection Guide
  • Choose 321 Globe Valve = when you need globe valve control + high temperature (300–550°C) + welded construction + general corrosion resistance + NO chlorides
  • It is the standard workhorse for steam, power, refinery, and high‑temperature process lines.

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