Hastelloy B2 Hastelloy B3 Nickel‑Molybdenum Reducing‑Acid Resistant Seamless Pipe

Hastelloy B2 Hastelloy B3 Nickel‑Molybdenum Reducing‑Acid Resistant Seamless Pipe | UNS N10665 UNS N10675 Alloy Tube

Exceptional corrosion resistance for pure hydrochloric acid across full concentration & temperature range
Great performance for other strong reducing corrosive medium: sulfuric acid, phosphoric acid
Hastelloy B3 improves thermal stability, greatly reduce risk of intermetallic phase precipitation
Low susceptibility to stress corrosion cracking under reducing‑acid service condition
Specially designed for hydrochloric‑acid synthesis, distillation and conveying equipment piping

Product Overview

Hastelloy B‑series nickel‑molybdenum alloys are developed for strong reducing corrosive environment. Hastelloy B2 (UNS N10665) offers premium hydrochloric‑acid corrosion resistance; Hastelloy B3 (UNS N10675) optimizes chemical composition, significantly enhances thermal stability compared to B2 grade, reducing brittle phase precipitation risk during welding and high‑temperature processing.

Our Hastelloy B2 / B3 seamless super alloy pipe adopts high‑purity remelted raw material, hot extrusion plus multi‑pass cold drawing process, full solution annealing treatment. Each pipe is inspected by ultrasonic and eddy‑current non‑destructive testing. Main applications cover hydrochloric‑acid reactor, distillation column, acid‑transport pipeline, organic‑synthesis chemical plant. We can deliver stock sizes and custom dimension according to client technical drawings, complete material test report will be provided for each shipment.

Nickel/Super Alloy Pipe

Chemical & Mechanical Property Snapshot

Grade	UNS No.	Ni(%)	Mo(%)	Fe(Max)	Cr(Max)	Yield Rp0.2 MPa Min	Tensile Rm MPa Min	Elongation A (%) Min
Hastelloy B2	N10665	Balance	26‑30	2.0	1.0	310	690	40
Hastelloy B3	N10675	Balance	27‑32	1.5	1.0	276	760	40

Detailed Technical Specifications

Item	Specification Details
Material Grade	Hastelloy B2, Hastelloy B3
UNS Code	UNS N10665, UNS N10675
Applicable Standards	ASTM B622, ASTM B829, ASME SB‑622
Pipe Manufacturing Type	Hot extruded seamless, Cold‑drawn seamless
Outer Diameter Range	10‑219mm; Custom special OD upon drawing
Wall Thickness Range	1.5‑20mm; heavy‑wall & thin‑wall available
Dimension Tolerance	OD: ±0.5 %‑±1 %; WT: ±7.5 % comply with ASTM B622
Available Length	Random mill length:3‑8m; Fixed cut length:1‑12m; Custom saw‑cut service
Delivery Condition	Solution Annealed & Pickled
Surface Options	Pickled bright annealed, Mechanical polishing
Pipe End Treatment	Plain end, Beveled end, Deburred end; Plastic end cap protection
Non‑Destructive Testing	Full‑body Ultrasonic Test(UT), Eddy‑Current Test(ET), Hydrostatic Test; PMI positive material identification
Destructive Lab Test	Chemical composition analysis, Tensile test, Hardness test, Flattening test, Flaring test
MOQ (Minimum Order Quantity)	5 Tons; small trial order negotiable subject to stock
Lead Time	Stock items:12‑20 working days; Custom production:42‑55 working days
Payment Term	T/T, Irrevocable L/C at sight
Packaging Details	Inner waterproof kraft paper; each pipe end fitted with plastic protective cap; bundled by steel strips; loaded into fumigated wooden pallet / solid wooden crate for ocean freight; anti‑moisture desiccant inside package
Trade Term	FOB, CFR, CIF, DAP, DDU
Document & Certificate	Mill Test Certificate MTC EN 10204 3.1; Third‑party inspection SGS/BV/LR available upon buyer request
Additional Service	Custom cutting, polishing, surface treatment, bundling mark, OEM label

Shape Options

Shape Type	Description & Typical Application
Round	Standard seamless round tube, widely used for fluid pipelines, boilers, hydraulic systems, and general structural projects
Square	Equal-side hollow square section, suitable for building frames, machinery supports, and heavy-load structural components
Rectangular	Unequal-side rectangular hollow section, ideal for beams, brackets, and vehicle chassis structural parts
Hexagonal	Hexagonal cross-section, suitable for drive shafts, mechanical fittings, and direct assembly without additional machining
Oval / Flat Oval	Oval hollow profile, used for automotive parts, agricultural machinery, and special frame structures
Special Custom Shaped	D-shaped, triangular, splined inner bore, lemon-shaped, and other non-standard profiles; custom production available according to customer drawings and samples

Dual‑unit Dimension Reference T

Outer Diameter (mm)	Outer Diameter (inch)	Wall Thickness (mm)	Wall Thickness (inch)
6	0.236″	0.8–2.0	0.031″–0.079″
12.7	0.50″	1.0–3.0	0.039″–0.118″
21.3	0.84″	1.5–4.0	0.059″–0.157″
33.7	1.33″	2.0–6.0	0.079″–0.236″
42.4	1.67″	2.0–8.0	0.079″–0.315″
60.3	2.37″	2.5–10	0.098″–0.394″
88.9	3.50″	3.0–12	0.118″–0.472″
114.3	4.50″	3.0–16	0.118″–0.630″
168.3	6.63″	4.0–20	0.157″–0.787″
219.1	8.63″	5.0–25	0.197″–0.984″
273	10.75″	6.0–30	0.236″–1.181″
323.9	12.75″	8.0–35	0.315″–1.378″
406.4	16.00″	10–40	0.394″–1.575″

Product Comparison Table

Grade	UNS	Alloy Feature	Main Corrosion Medium	Typical Application	W.Nr Equivalent
Hastelloy B2	N10665	High‑Mo nickel alloy	Hydrochloric acid, reducing acid	HCl chemical equipment	2.4617
Hastelloy B3	N10675	Optimized thermal‑stable B‑series	Hydrochloric acid, reducing acid	HCl reactor & piping	2.4600
Hastelloy C276	N10276	Ni‑Cr‑Mo‑W	Mixed oxidizing‑reducing medium	FGD, multi‑acid process	2.4819

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Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What is difference between Hastelloy B2 and B3 pipe?

Hastelloy B3 improves thermal stability, effectively avoids brittle phase precipitation during welding and high‑temperature exposure compared with B2.

Can Hastelloy B‑series alloy contact oxidizing ion such as ferric chloride?

Not recommended, B‑series alloy is for pure reducing‑acid environment; oxidizing impurity will accelerate corrosion rate heavily.

Which industry mainly purchases Hastelloy B3 seamless pipe?

Hydrochloric acid production, organic chemical synthesis, fine‑chemical distillation equipment.

Do you support custom wall‑thickness for Hastelloy B‑series pipe?

Yes, non‑standard dimension can be produced per drawing, longer production lead‑time required.

Is post‑weld heat treatment required for Hastelloy B3 pipe?

Normally not necessary for solution‑annealed base material, follow site engineering welding specification.

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Hastelloy B2 Hastelloy B3 Nickel‑Molybdenum Reducing‑Acid Resistant Seamless Pipe | UNS N10665 UNS N10675 Alloy Tube