Industry Solutions

Petrochemical Industry

High-alloy pipe and tube solutions for ethylene crackers, aromatics plants, polymer reactors, and chemical complexes — engineered for extreme temperature, acid service, and thermal cycling.

Full PMI Testing ASME B31.3 Compliant Seamless & Welded Emergency Stock Available
Overview

High-Alloy Pipes for Petrochemical Plants & Complexes

Petrochemical feedstock cracking, aromatics extraction, and polymer synthesis expose piping systems to elevated temperatures, organic acid attack, hydrogen embrittlement, and thermal cycling. Material selection in these environments directly determines plant reliability and run-length between shutdowns. Metinox Overseas supplies precision high-alloy pipes and tubes — from chrome-moly to Hastelloy — that perform reliably across ethylene crackers, styrene plants, and aromatics complexes.

Where We Deliver

Key Applications & Grade Rationale

Key Applications

  • Ethylene cracker furnace coils — radiant and convection sections at 800–950°C
  • Aromatics extraction (BTX) process lines handling benzene, toluene, and xylene
  • Styrene monomer dehydrogenation reactors and transfer lines
  • HF alkylation unit piping in refinery-petrochemical integration
  • High-pressure polymer reactor jackets and heat exchanger tubes
  • Catalyst regeneration lines subject to oxidising atmospheres at high temperatures
  • Overhead condenser tubing in distillation columns

Why These Grades?

Alloy 20 (UNS N08020) Engineered specifically for sulfuric acid environments; superior to 316L in H₂SO₄ concentrations from 5–95% at elevated temperatures.
Hastelloy C-276 (UNS N10276) Benchmark alloy for mixed-acid environments, wet chlorine gas, and HF service in petrochemical plants.
Inconel 601 (UNS N06601) Outstanding high-temperature oxidation resistance up to 1200°C for furnace tube applications.
SS 321 / 347 (stabilised grades) Ti/Nb-stabilised austenitic steels that resist sensitisation in the 425–815°C range.
Product Range

Recommended Products & Grades

Product Recommended Grades Ideal Application
Stainless Steel Pipes SS 321, SS 347, SS 310S High-temp process lines, furnace piping, sensitisation-prone zones
Hastelloy Pipes C-276, C-22, B-2 Acid service, HF alkylation, chlorinated solvents
Alloy 20 Pipes UNS N08020 Sulfuric acid lines, fertiliser intermediates
Inconel Pipes 601 Alloy 601, Alloy 690 Cracker furnace coils, oxidising high-temp service
Alloy Steel Pipes P5, P9, P22, P91 High-temp hydrocarbon service, catalytic reformers
Why Choose Us

Key Benefits

Extreme Temperature Ratings

Alloys proven to 1200°C continuous service for cracker and furnace applications.

Acid-Specific Alloy Selection

Matched to your exact corrosive media — sulfuric, hydrofluoric, or mixed-acid service.

Full PMI Testing

Positive Material Identification on all exotic alloys for guaranteed composition traceability.

Emergency Stock

Ready inventory for unplanned plant shutdowns and turnarounds — fast turnaround.

Expert Guidance

Why Metinox Overseas — FAQs

Why use SS 321 instead of SS 316L in petrochemical piping?
SS 321 contains titanium (min 5× carbon content) that preferentially forms TiC instead of chromium carbides during slow cooling through the sensitisation range (425–815°C). This preserves grain boundary chromium content, preventing intergranular corrosion — a common failure mode in process lines that run intermittently or in heat-affected zones of welds.
What makes Hastelloy C-276 the preferred choice for HF alkylation units?
C-276 contains 16% Mo and 15% Cr with very low carbon and silicon, making it extremely resistant to both oxidising and reducing acids. Its molybdenum content specifically resists pitting in chloride-containing acids like HF. It also maintains corrosion resistance in the as-welded condition without PWHT — critical for field-erected piping.

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