Termisk stabil Hastelloy C4 uden søm rør

Product Overview

Hastelloy C4 is a premier nickel-base solid-solution alloy modified with titanium stabilization to enhance thermal stability significantly over conventional nickel-molybdenum-chromium grades. Our OD 19mm WT 1.5mm seamless tubing undergoes multiple cold-drawing passes and controlled bright annealing, yielding an ultra-smooth internal bore that minimizes fluid drag, prevents fouling, and guarantees uniform thermal dissipation.

Every tube length is subjected to rigorous internal quality protocols—including 100% digital eddy current testing, hydrostatic pressure verification, and microstructural grain-size evaluation—to verify zero metallurgical discontinuities and precise concentricity for tube-to-tubesheet expansion or orbital welding.

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Technical Specifications of Alloy C4 Tubing

Table 1: Quantitative Chemical Composition Analysis (Nominal wt%)

Element	Symbol	Composition Range (%)	Engineering Function / Metallurgical Role
Nickel	Ni	Balance (~65.0%)	Base matrix providing superior resistance to reducing acids & stress corrosion cracking
Chromium	Cr	14.50 – 17.50%	Imparts robust passivity and oxidation resistance in high-temperature acid vapors
Molybdenum	Mo	14.00 – 17.00%	Delivers critical defense against pitting, crevice corrosion, and non-oxidizing acids
Titanium	Ti	≤ 0.70%	Titanium stabilization to suppress grain-boundary carbide & intermetallic precipitation
Iron	Fe	≤ 3.00%	Residual control for enhanced structural ductility and structural stability
Cobalt	Co	≤ 2.00%	Controlled impurity limit to preserve high-temperature corrosion resistance
Manganese	Mn	≤ 1.00%	Deoxidation and hot-workability control
Silicon	Si	≤ 0.08%	Strict ultra-low trace limit to prevent intergranular phase formation
Carbon	C	≤ 0.015%	Ultra-low carbon melt ensuring high intergranular resistance during thermal cycling
Phosphorus	P	≤ 0.04%	Ultra-low residual limit
Sulfur	S	≤ 0.03%	Ultra-low residual limit to guarantee hot ductility and clean weldability

Table 2: Physical & Mechanical Properties of Alloy C4 Tubing

Technical Parameter	Metric / Engineering Value	Test Condition / Delivery Specification
Density	8.64 g/cm³ (0.312 lb/in³)	Solid material density at 20°C
Melting Point Range	1350°C – 1400°C (2462°F – 2552°F)	Liquidus / Solidus range
Tensile Strength ( $R_{m}$ )	$\geq 690 MPa$ ( $\geq 100 ksi$ )	Solution annealed condition (Room Temperature)
Yield Strength ( $R_{p 0.2}$ )	$\geq 290 MPa$ ( $\geq 42 ksi$ )	0.2% Offset proof strength
Elongation ( $A_{5}$ )	$\geq 40 %$	Gauge length = 50mm
Hardness	$\leq 100 HRB$ ( $\leq 240 HV$ )	Fully softened solution bright-annealed state
Surface Roughness	$Ra \leq 0.4 μ m$ ( $\leq 16 μ in$ )	Precision bright annealed / Pickled / Electropolished
Standard Dimensions	$OD 19.00 mm$ , $WT 1.50 mm$	Tight micrometer concentricity & wall tolerance
Supply Lengths & Shapes	Up to $12, 000 mm$ (Straight Lengths / Precision U-Tubes)	Ready for direct condenser tube sheet expansion
Non-Destructive Testing	100% Eddy Current + Hydrostatic Testing	Zero metallurgical defects / Zero micro-leakage

Product Features

Exceptional High-Temperature Thermal Stability: Titanium-stabilized metallurgy prevents the formation of grain-boundary chromium and molybdenum precipitates in the critical 650°C to 1040°C aging zone, ensuring full ductility and corrosion resistance even after hot forming or thermal cycling.
Wide-Spectrum Chemical Resistance: Outstanding resistance to hot contaminated mineral acids (sulfuric, hydrochloric, phosphoric, and nitric acid mixtures), wet chlorine gas, chloride salts, and organic solvents.
Superior Resistance to Localized Attack: High PREN value delivers robust defense against pitting, crevice corrosion, and chloride-induced stress corrosion cracking (SCC) in severe condenser cooling waters.
Precise Dimensional Uniformity: Outer diameter (OD 19mm) and wall thickness (WT 1.5mm) are controlled within tight micrometer tolerances, facilitating clean, automated orbital welding and secure roller-expansion into condenser tube sheets.
High Structural Integrity: Annealed condition delivers balanced tensile strength (≥ 690 MPa) and high elongation (≥ 40%), providing structural durability against high-pressure thermal shock.

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Product Applications

Chemical Process Condensers: Vapor condensing and reflux systems handling hot hydrochloric, sulfuric, formic, and acetic acid streams.
Wet Chlorine & Flue Gas Cooling: Condensing tubes for wet chlorine gas coolers, sulfur dioxide scrubbers, and incinerator flue-gas quenchers.
Pharmaceutical & Fine Chemical Synthesis: High-purity heat exchangers requiring absolute zero metal leaching and resistance to aggressive organic chlorination catalysts.
Petrochemical & Fertilizer Plants: Condensers handling hot contaminated organic and inorganic acid mixtures, ammonium nitrate coolers, and sour gas processing units.
Offshore & Marine Heat Exchangers: High-efficiency tubular coolers exposed to heavy chloride, sea mist, and acidic condensate mixtures.

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Why Choose DLX Alloy

Integrated Melt-to-Tube Manufacturing: Full-chain processing from vacuum induction melting (VIM) and electroslag remelting (ESR) through precision cold pilgering and drawing.
Substantial Scalable Supply: Operating a monthly output capacity of 1,200 metric tons, ensuring stable lead times and volume availability for critical engineering projects and turnkey refinery upgrades.
100% In-House Non-Destructive Testing: Every single tube undergoes digital multi-channel eddy current inspection, hydrostatic testing up to high design pressures, and dimensional PMI verification prior to dispatch.
Tailored B2B Project Service: Flexible MOQ scheduling configured according to project specifications and custom length requirements; export-grade seaworthy packaging in fumigated reinforced wooden crates.

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Frequently Asked Questions

Q1: Why is Hastelloy C4 preferred over Alloy C276 for high-temperature chemical condensers?

A1: While both alloys offer outstanding general corrosion resistance, Hastelloy C4 features titanium stabilization and reduced tungsten/iron levels. This composition minimizes grain-boundary carbide and intermetallic phase precipitation during continuous exposure at 650°C to 1040°C, retaining high ductility and intergranular corrosion resistance in hot condensates.

Q2: What non-destructive inspection methods are implemented on OD 19mm WT 1.5mm tubes?

A2: All DLX Alloy tubes undergo 100% digital eddy current testing for surface and sub-surface flaw detection, hydrostatic pressure testing, ultrasonic wall thickness scanning, and positive material identification (PMI) spectral analysis.

Q3: Can DLX Alloy supply these tubes as pre-formed U-tubes for condenser bundles?

A3: Yes. We provide full U-bending services in accordance with condenser bundle layout drawings, complete with post-bend localized stress-relief annealing and dimensional radius inspection.

Q4: What is the minimum order quantity (MOQ) and packaging standard for international shipment?

A4: We implement dynamic MOQs tailored to specific production campaigns and cut-to-length requirements. Tubes are thoroughly cleaned, end-capped with protective PE plugs, wrapped in moisture-barrier film, and packed into reinforced plywood cases suitable for air, sea, or multimodal container transport.

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