Hastelloy B3 Pipe Manufacturer in China
Kaysuns is a top-tier Chinese Hastelloy B3 pipe manufacturer with over a ten-year track record in production and international trade.With ample inventory on hand,we are ready to ship your order at any time.Don’t hesitate to contact us for a free,rapid quote or to inquire about our products.
Hastelloy B3 Pipe is a nickel-molybdenum alloy pipe specifically designed for extreme resistance to hydrochloric acid (HCl) and other strong reducing acids.It is the upgraded version of Hastelloy B2 pipe, offering better thermal stability during fabrication.
Наши возможности
We specialize in manufacturing Hastelloy B3 alloy pipes in a wide range of specifications:seamless pipes ranging from 1/2 inch to 24 inches (6 mm – 610 mm),and welded pipes ranging from 6 inches to 104 inches (159 mm – 2800 mm).
With over a decade of extensive manufacturing experience,we are able to respond flexibly and quickly to delivery requirements and provide comprehensive,one-stop product solutions.Even for small-batch orders,we insist on using state-of-the-art equipment to ensure that every product meets the highest quality standards.
Hastelloy B3 Equivalent Designations
- UNS N10675
- W.Nr. 2.4600
- EN NiMo30Cr
- GB NS3203
- ASTM B622 / SB622
- ASTM B619 / SB619 / B626 / SB626
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Standards of Hastelloy B3 Pipe & Tube
The following is a comparison table of commonly used ASTM (American Society for Testing and Materials) and ASME (American Society of Mechanical Engineers) standards for Hastelloy B3 pipes and related components:
| Форма продукта | Стандарт ASTM | Стандарт ASME | Описание / Применение |
|---|---|---|---|
| Бесшовные трубы и трубки | ASTM B622 | ASME SB622 | High-pressure piping and tubing without weld seams. |
| Сварная труба | ASTM B619 | ASME SB619 | Large diameter process piping for chemical plants. |
| Сварная труба | ASTM B626 | ASME SB626 | Specifically for Heat Exchangers and Condensers. |
Соответствующие стандарты компонентов
- Pipe Fittings: ASTM B366 / ASME SB366.(Wrought fittings like Elbows, Tees, and Reducers.)
- Forgings & Flanges: ASTM B564 / ASME SB564.(Custom forgings, flanges, and machined parts.)
- Rod & Bar: ASTM B335 / ASME SB335.(Round bars for fasteners, bolts, and valve stems.)
- Plate & Sheet: ASTM B333 / ASME SB333.(Raw material for vessel shells and welded structures.)
Chemical Composition of Hastelloy B3 Pipe, wt.%
The chemical composition of Hastelloy B3 is precisely controlled to maximize its resistance to reducing acids (like HCl) while improving thermal stability compared to older B-series alloys.
| Ni | Пн | Cr | Fe | W | Mn | Co | Si | C | Al | Ti | п | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Остаток средств | 27.0 – 32.0 | 1,0 – 3,0 | 1,0 – 3,0 | 3.0 Макс | 3.0 Макс | 3.0 Макс | 0.10 Макс | 0.01 Макс | 0.50 Макс | 0.20 Макс | 0,03 макс. | 0.01 Макс |
Основные технические замечания
- High Molybdenum (Mo):
The 28.5% (average) molybdenum content is the primary reason for its exceptional resistance to Hydrochloric Acid across all concentrations and temperatures. - Low Chromium (Cr):
Because chromium is low,this alloy is not suitable for oxidizing environments (e.g., Nitric Acid) or in the presence of oxidizing salts like Ferric or Cupric chlorides. - Термическая стабильность:
The specific balance of elements in B3 prevents the precipitation of detrimental intermetallic phases during welding,which was a common issue with the older Hastelloy B2 grade.
Why Can't B3 Pipes Be Used For Nitric Acid?
This is because its chromium (Cr) content is extremely low (only 1.0%–3.0%).Chromium is a key element in the formation of a protective oxide film (passivation layer) that resists oxidizing acids.Since B3 contains virtually no chromium,it corrodes rapidly in oxidizing media such as nitric acid or solutions containing ferric chloride or copper chloride.
Mechanical Properties of Hastelloy B3 Pipe
The mechanical properties of Hastelloy B3 are designed to ensure that it not only resists corrosion in extreme chemical environments but also withstands high pressure and thermal processing stresses.Compared to B2,the most significant improvement in B3 is its ability to maintain good ductility and toughness even after undergoing heat treatment cycles.
| Предел прочности | Предел текучести | Удлинение | Твердость | Плотность |
|---|---|---|---|---|
| ≥ 760 МПа (110 ksi) | ≥ 350 МПа (51 ksi) | ≥ 40% | ≤ 100 HRB | 9.24 g/cm3(0.334 lb/in3) |
Does Welding Reduce The Strength of B3 Pipes?
Generally,no.When using the correct welding process (such as GTAW/TIG) and appropriate welding consumables (such as ERNiMo-10),the mechanical properties of the weld metal are typically on par with those of the base metal.It is recommended to strictly control the interpass temperature (below 100°C) during welding to prevent excessive heat input from compromising mechanical properties.
Thermal Properties of Hastelloy B3 Pipe
| Имущество | Метрическое значение | Имперское значение |
|---|---|---|
| Диапазон плавления | 1370 – 1418°C | 2500 – 2585°F |
| Теплопроводность | 11.2 W/m·°C (at 25°C) | 78 Btu·in/ft²·h·°F |
| Удельная теплота | 397 J/kg·°C (at 25°C) | 0.095 Btu/lb·°F |
| Среднее значение CTE | 10.6 μm/m·°C (25-100°C) | 5.9 μin/in·°F |
Why Does B3 Emphasize “Thermal Stability”?
When B2 alloy is subjected to welding or hot working,even slightly slower cooling can cause rapid precipitation of brittle phases,making the material as brittle as ceramic.
B3 significantly delays this precipitation process.It maintains better toughness in the heat-affected zone (HAZ),allowing for a wider welding process window and significantly reducing the risk of cracking during processing.
What is The Maximum Safe Operating Temperature For This Alloy?
Although it has a high melting point, the recommended upper limit in acidic media is 427°C (800°F).This is because prolonged exposure to temperatures above this threshold can cause thermal embrittlement.Furthermore,in oxidizing environments,its resistance to oxidation decreases rapidly due to the lack of chromium protection.
How Do You Perform Solution Annealing To Restore Thermal Properties?
Heat to approximately 1065°C (1950°F) and hold for a sufficient period to ensure uniform microstructure;then,rapid water quenching or rapid air cooling (for thin-walled parts) must be performed to “lock in” the austenitic microstructure and prevent the precipitation of harmful phases.
Corrosion Rates of Hastelloy B3 in Hydrochloric Acid (HCl)
| HCl Concentration (wt.%) | Температура | Состояние | Corrosion Rate (mm/y) |
|---|---|---|---|
| 5% | 70°C(158°F) | Hot | < 0.02 |
| 101°C(214°F) | Boiling | 0.41 | |
| 10% | 70°C(158°F) | Hot | 0.13 |
| 102°C(216°F) | Boiling | 0.46 | |
| 15% | 70°C(158°F) | Hot | 0.23 |
| 104°C(219°F) | Boiling | 0.51 | |
| 20% | 70°C(158°F) | Hot | 0.28 |
| 108°C(226°F) | Boiling | 0.58 | |
| 30% | 50°C(122°F) | Warm | 0.15 |
| 37% | 50°C(122°F) | Warm | 0.25 |
Key Findings and Design Recommendations
- Full Concentration Coverage:
Hastelloy B3 is one of the very few metallic materials capable of maintaining a low corrosion rate across the entire concentration range (from 0% to 37%) and up to the boiling point.
- Characteristics Of The Isocorrosion Curve:
In the isocorrosion curve at 0.1 mm/y,the temperature range of B3 is significantly higher than that of stainless steel or typical nickel-based alloys (such as C276). - Warning—Oxidizer:
- The data above is based on the assumption that the substance is pure hydrochloric acid.
- If hydrochloric acid contains more than 5 ppm of iron ions (Fe³⁺) or copper ions (Cu²⁺),the corrosion rate can instantly increase by a factor of tens.This is because B3 is extremely susceptible to attack by oxidizing ions.
- Welding Effects:
Due to B-3’s excellent thermal stability,the corrosion rate in its heat-affected zone (HAZ) is typically comparable to that of the base material,so there is no need to worry about preferential corrosion at the weld.
Applications of Hastelloy B3 Pipe
- HCl Production & Handling
- Acetic Acid Processing
- Sulfuric Acid Recovery
- Alkylation Units
- Pesticide & Herbicide Production
- Фармацевтические промежуточные продукты
- Chlorination Systems
- Acid Waste Treatment
- Flue Gas Scrubber Components
- R&D and Pilot Plants
FAQs About Hastelloy B3 Pipe
Oxidizing environments.B3 contains virtually no chromium (Cr) and must therefore never be used in nitric acid or in solutions containing iron (III) ions (Fe³⁺) or copper (II) ions (Cu²⁺).In these oxidizing media,B3 will corrode extremely rapidly.
It depends on the specific circumstances.
For purely reducing acids (such as pure hydrochloric acid),B3 performs significantly better than C276.
If the medium contains oxidizing impurities (such as dissolved oxygen,chlorine gas,or iron ions),C276 must be used.
This is generally not necessary.B3 is specifically designed for use in the as-welded condition.Unless there are special requirements or the material has undergone severe cold working,local heat treatment is not recommended,as improper heating may actually impair performance.
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- RM901 No.22 Tangjiaqiao Road Wenzhou Китай
- +86 577 8551 1171
- [email protected]
- https://www.kaysuns.com/
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