01
ASTM B444 / B444M
Nickel-chromium-molybdenum-columbium alloy pipe and tube
Standard specification for seamless nickel-chromium-molybdenum-columbium alloy pipe and tube for general corrosion-resistant and high-temperature service.
Nickel Alloy — Industrial Product
Inconel 625 Tubes & Pipes
Inconel 625 nickel alloy tubes and pipes supplied to ASTM B444 / B704 / B705 for chemical processing, marine, offshore and high-temperature service.
Indicative priceUSD 35,000 - 55,000 / MT (volume, OD/WT, standard and condition dependent)
Lead time30 - 60 working days
01
概述
Inconel 625 Tubes & Pipes combine a nickel-chromium matrix with molybdenum and niobium additions to deliver exceptional resistance to pitting, crevice and stress-corrosion cracking across a wide range of corrosive media. The alloy retains useful strength from cryogenic temperatures up to approximately 1000 °C and is supplied in the annealed condition for general chemical, marine and offshore service. Tubes are drawn or hot finished per ASTM B444, with welded tube and pipe supplied to ASTM B704 and ASTM B705 as applicable. The combination of corrosion resistance, weldability and thermal stability makes the product suited to chemical process piping, heat exchanger and condenser tubing, offshore flow lines, seawater piping systems and exhaust ducting in marine and power-generation service. Each delivery is supported by mill test certification per EN 10204 3.1 and full traceability of heat number and chemical analysis.
核心特性
- 01 耐腐蚀性 在工业腐蚀环境中提供更佳的耐受能力。
- 02 耐氯化物腐蚀 在海洋及含盐介质中抵抗氯离子引发的点蚀和缝隙腐蚀。
- 03 耐应力腐蚀性 在合适工况下对应力腐蚀开裂具有更佳的耐受能力。
- 04 高温适用性 在适用材料范围内可适用于高温工况。
- 05 低温韧性 在低至约 -196 °C 的低温下保持良好的延展性和冲击韧性。
- 06 抗氧化性 在高温下对抗氧化及起皮具有耐受能力。
- 07 良好焊接性 采用合适的工艺与匹配的填充材料支持焊接。
- 08 良好成形性 在合适工艺条件下支持弯曲、成形及其他制造工艺。
- 09 无缝结构 产品本体无纵向焊缝。
- 10 精密尺寸 可提供受控的尺寸，适用于需要一致配合与装配的应用。
- 11 符合标准 按照指定的材料与产品标准制造与供货。
- 12 第三方检验 可根据项目与采购要求安排第三方检验。
典型应用
- 化工处理 用于腐蚀性及高纯度介质的工艺管道、输送线与设备。
- 海洋工程 暴露于含氯海洋环境中的管道、结构件与设备部件。
- 油气服务 用于陆上与海上油气上游、中游及下游的工艺管道、流送线及公用工程系统。
- 石化 用于炼油与石化厂的管道系统，处理烃类及工艺化学品。
- 换热器 用于暖通空调、工艺及制冷工况的管壳式、板式及翅片式换热器。
- 电力发电 常规及联合循环电站的管道、管材与结构部件。
- 造船 用于商用及海军船舶建造的船体、结构型材及管道。
- 焊接与制造 适用于焊接制造的金属结构、组件与加工部件。
02
技术规格
本节数据对应所适用产品标准的相关参数，可直接用于询价与审批文件。
产品规格
- Material
- Nickel-chromium-molybdenum-niobium alloy
- Grade
- Inconel 625 / NiCr22Mo9Nb / 2.4856
- UNS_designation
- N06625
- Product_form
- Seamless or welded tube / pipe
- Manufacturing_method
- Cold drawn seamless; hot finished seamless; welded and redrawn
- Condition
- Solution annealed
- Surface
- Annealed & pickled; bright annealed on request
- Cross_section
- Hollow circular, uniform wall thickness
- End_condition
- Plain end; cut-to-length or machined ends on request
供货规格
- Outside_diameter
- 6 - 260 mm (drawn seamless); larger sizes as hot finished or welded
- Wall_thickness
- 0.5 - 25 mm typical; subject to OD and mill capability
- Inside_diameter
- Per OD and wall thickness combination
- Length
- Up to 12 m; cut-to-length on request
- Shape
- Round; U-bend tube available on request
- Tolerance
- Per ASTM B444 (drawn) / ASTM B704 (welded tube) / ASTM B705 (welded pipe) as applicable
- Surface_finish
- Annealed & pickled; bright annealed, polished or ground on request
- Marking
- Standard mill marking including grade, size, heat number and standard; customer marking on request
Final supply is confirmed against the project drawing, purchase agreement and the mill test certificate.
化学成分
ElementRequirement
Ni >= 58.0 %
Cr 20.0 - 23.0 %
Mo 8.0 - 10.0 %
Nb + Ta 3.15 - 4.15 %
Fe <= 5.0 %
Mn <= 0.50 %
Si <= 0.50 %
C <= 0.10 %
Al <= 0.40 %
Ti <= 0.40 %
Co <= 1.0 %
P <= 0.015 %
S <= 0.015 %
Reference: Per ASTM B444 / B704 / B705 for Inconel 625 (UNS N06625).
机械性能
PropertyRequirement
Tensile strength (Rm, annealed) >= 827 MPa
Yield strength (Rp0.2, annealed) >= 414 MPa
Elongation in 50 mm (annealed) >= 30 %
Hardness_annealed <= 287 HB / ~100 HRB
Tensile strength (Rm) at 650 °C ~700 MPa (typical)
Yield strength (Rp0.2) at 650 °C ~480 MPa (typical)
Tensile strength (Rm) at 870 °C ~340 MPa (typical)
Impact toughness (annealed, -196 °C) >= 120 J (typical)
Reference: Annealed condition values per ASTM B444 at room temperature; elevated-temperature values are typical and provided for design reference only.
物理性能
PropertyTypical Value
Density 8.44 g/cm³
Melting range 1290 - 1350 °C
Elastic modulus 207 GPa at 20 °C
Shear modulus 82 GPa at 20 °C
Poisson's ratio 0.278
Thermal conductivity 12.1 W/m·K at 20 °C
Specific heat 410 J/kg·K at 20 °C
Electrical resistivity 1.29 µΩ·m at 20 °C
Thermal expansion (20 - 100 °C) 12.8 x 10⁻⁶ /°C
Curie temperature Non-magnetic (essentially)
Reference: Typical material values for Inconel 625 nickel alloy in the annealed condition.
参考体系
标准与文件
适用的产品、尺寸与检验标准应在采购技术规范中一并确认。
02
ASTM B704 / B704M
Welded nickel alloy tubes
Standard specification for welded nickel alloy tubes for general corrosion-resistant service at low and moderate temperatures.
03
ASTM B705 / B705M
Welded nickel alloy pipe
Standard specification for welded nickel alloy pipe for general corrosion-resistant service at low and moderate temperatures.
04
ASME SB444 / SB444M
ASME pressure vessel equivalent
ASME counterpart of ASTM B444 for pressure vessel and high-temperature applications.
05
AMS 5581 / AMS 5599
Aerospace Material Specification - Inconel 625 tube
Aerospace Material Specification reference for Inconel 625 seamless tube, including close-tolerance drawn product.
06
EN 10216-5 / EN 10217-5
European seamless and welded nickel alloy tubes
European reference for seamless and welded stainless and nickel alloy tubes for pressure purposes.
07
EN 10204
Inspection documents
Defines inspection document types such as 3.1 and 3.2 for metallic product delivery.
03
供应能力
从定制尺寸、精密规格到热处理、表面精加工及产品专用工艺，Wayland 根据您的具体需求协调定制化供应解决方案。
切割
按订单要求提供定尺切割和定制切割。
非标尺寸定制
在产品和轧机能力允许的范围内，提供非标尺寸、公差和尺寸组合。
精密定径
针对更严格的公差要求进行精密定径和尺寸控制。
冷加工
按需进行冷拔、冷定径及其他冷加工工艺。
热处理
依据材料、规格及适用标准进行热处理。
表面处理
依据产品、规格及应用要求进行表面处理与精整。
表面涂层与电镀
依据产品与应用要求进行涂层、电镀及其他表面防护处理。
成形加工
依据图纸或订单要求进行弯曲、成形及其他形状加工。
管端加工
依据产品要求进行坡口、螺纹、倒角及其他管端加工。
机加工
按需进行车削、钻孔、铣削及其他机加工。
焊接与制作
依据图纸及项目要求进行焊接、制作及相关装配。
测试与检验
按适用标准和客户规范进行力学、化学及无损检测。
定制服务
可根据项目规格提供定制尺寸、长度、表面状态、管端处理及检验要求。最终供应能力将依据牌号、规格范围和适用标准，在每次询价时确认。
04
质量
检验与文档流程依据适用产品标准及项目规范要求执行。
- 尺寸检验 依据适用产品标准核查几何尺寸与公差
- 外观与表面检验 表面状态、标识及整体外观
文档
- 检验报告
- 化学成分分析 按炉次，依据适用标准
- 力学性能测试 抗拉强度、屈服强度、伸长率与硬度
- 无损检测 超声波、涡流、水压试验或其他适用的无损检测方法
- 材料牌号鉴别 (PMI) 需要时进行合金牌号验证
文档
- 材料质量证明书 (MTC)
- 炉号可追溯 炉号贯穿于材料质量证明书与产品标识
- 第三方检验协调 可应要求安排 SGS / BV / TÜV 检验
文档
- 第三方检验报告
- EN 10204 文件 标配 3.1 MTC；可应要求提供 3.2
文档
- EN 10204 3.1 材料质量证明书
- EN 10204 3.2 检验证书
- 原产地证书
05
选型
一份准备充分的规格书，是抵御反复澄清沟通最有效的防线。
- 01 选择材料与牌号
根据使用工况、性能要求和适用标准选择材料牌号。
- 02 确定规格与供货状态
明确所需尺寸、表面状态、热处理状态及交货要求。
- 03 确认标准与规范要求
注明适用的产品标准、尺寸标准及适用的项目规范。
- 04 确定检验与文件要求
下单前确认检验、试验、认证及文件提交要求。
采购规范示例
A complete specification suitable for enquiry, covering product, technical requirements, certification and delivery terms.
- Product
- Inconel 625 Tubes & Pipes
- Grade
- Inconel 625
- Standard
- ASTM B444
- Dimensions
- OD 25.4 mm x Wall 2.77 mm x Length 6000 mm; Round; Annealed; or per drawing
- Condition
- Solution Annealed; Annealed & Pickled; Plain End
- Certification
- EN 10204 3.1 Mill Test Certificate
- Quantity
- 20 Metric Tons
- Packaging
- Seaworthy Export Packing
- Incoterm
- CIF Hamburg
06
物流
从工厂发运到目的港的每个环节均由指定货代协调配合，并按采购规范提供完整单据。
-
包装
适用于出口的包装方案，并提供表面与边角防护。
根据产品形态与运输方式，捆扎、包覆或装箱。外表面使用耐候材料保护，端部与边角加装防护以避免运输损伤。
-
装运
标准尺寸采用整箱装载；超大件货物安排散货出运。
通过指定货代进行集装箱装载。LCL 拼箱及超出集装箱尺寸的货物，依据工厂发运计划协调安排。
-
单据
商业发票、装箱单与原产地证书。
工厂单据随货物同行。按采购规范提供 EN 10204 3.1 / 3.2 证书及第三方检验报告。
-
运输
默认采用海运；可应要求安排其他运输方式。
可采用 FCL / LCL 集装箱运输，或针对超大尺寸货物安排散货出运。物流通过指定货代协调。
-
交付
可提供 FOB · CFR · CIF · FCA · EXW 多种贸易条款。
适用《2020 年国际贸易术语解释通则》。装货港：上海 / 宁波 / 深圳。最终目的地与贸易条款按询盘确认。
07
常见问题
大多数询价最终归结为一组反复出现的技术问题。
01 What is Inconel 625?
Inconel 625 (UNS N06625 / NiCr22Mo9Nb / 2.4856) is a nickel-chromium alloy strengthened by molybdenum and niobium additions. It offers exceptional resistance to pitting, crevice and stress-corrosion cracking in chloride-containing environments and is suitable for service from cryogenic temperatures up to approximately 1000 °C.
02 What standards cover Inconel 625 tube and pipe?
Seamless tube and pipe are supplied to ASTM B444 (seamless tube), ASTM B704 (welded tube) and ASTM B705 (welded pipe). Aerospace references include AMS 5581 / AMS 5599. EN 10216-5 and EN 10217-5 are the typical European references for pressure service.
03 What manufacturing methods are available for Inconel 625 tube?
Cold drawn seamless (B444) for tight tolerance and smoother surface, hot finished seamless for larger diameters and heavier walls, and welded and redrawn (B704 / B705) for cost-effective larger sizes where seamless is not required.
04 Is Inconel 625 suitable for seawater and offshore service?
Yes. The high nickel and molybdenum content gives Inconel 625 strong resistance to chloride-induced pitting and crevice corrosion, making it a standard selection for seawater piping, offshore flow lines and marine exhaust systems where 316L stainless is not adequate.
05 Is Inconel 625 weldable?
Yes. Inconel 625 is readily weldable using GTAW, GMAW and other conventional processes with matching Inconel 625 filler (ERNiCrMo-3). Post-weld heat treatment is generally not required for the annealed condition.
06 What temperature range can Inconel 625 tube operate at?
Inconel 625 retains useful mechanical properties from cryogenic temperatures up to approximately 1000 °C in intermittent service and around 650 °C in continuous structural service. Above approximately 1000 °C, oxidation resistance becomes the limiting factor for long-term exposure.