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304不锈钢管 - ASTM A312无缝及焊接管
快马钢铁有限公司
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定制生产厂家
·
7 年
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China
China
可定制
超低价
$2850
1-49 吨
基准价
$2725
50-99 吨
4.4% 优惠
$2660
≥100 吨
6.7% 优惠
价格有效期：随行就市
付款与交货
- 交期：
- 随报价一并确认
- 包装：
- 标准出口包装
- 样品：
- 可按需提供
不锈钢水槽管
$630
1 吨 （最小起订量）
不锈钢管
$2200
1 吨 （最小起订量）
2205双相不锈钢管
$2035 - $2180
1 吨 （最小起订量）
不锈钢管尺寸
$1290 - $1380
1 吨 （最小起订量）
6不锈钢管
$2500
1 吨 （最小起订量）
2205双相不锈钢管
$1350
1 吨 （最小起订量）
316不锈钢管供应商
$2200
1 吨 （最小起订量）
410不锈钢管
$1730 - $1850
1 吨 （最小起订量）
250毫米不锈钢管夹
$1600
1 吨 （最小起订量）
抛光不锈钢管
$1310 - $1400
1 吨 （最小起订量）
不锈钢管道预制
$3020 - $3245
1 吨 （最小起订量）
36不锈钢管
$1560
1 吨 （最小起订量）
产品详情
304不锈钢管技术规格
| 属性 | 参数 | 描述 |
|---|---|---|
| 产品名称 | 304 Stainless Steel Pipe | 奥氏体铬镍不锈钢管 |
| 材料牌号 | 304 / AISI 304 / EN 1.4301 / UNS S30400 | 国际牌号对应 |
| 标准符合性 | ASTM A312, ASTM A269, EN 10217-7, JIS G3459 | 符合主要国际标准 |
| 碳 (C) | ≤0.08% | 碳含量影响强度和焊接性 |
| 铬 (Cr) | 18.0-20.0% | 提供耐腐蚀性 |
| 镍 (Ni) | 8.0-10.5% | 增强延展性和耐腐蚀性 |
| 锰 (Mn) | ≤2.0% | 提高强度和加工性 |
| 硅 (Si) | ≤1.0% | 脱氧剂和强化剂 |
| 磷 (P) | ≤0.045% | 控制含量以保证延展性 |
| 硫 (S) | ≤0.030% | 低硫含量以改善焊接性 |
| 抗拉强度 | ≥515 MPa | 按 ASTM A312 规定的最小抗拉强度 |
| 屈服强度 | ≥205 MPa | 最小屈服强度 |
| 延伸率 | ≥35% | 50mm 标距内的延展性 |
| 硬度 | ≤201 HBW / ≤92 HRB | 最大硬度值 |
| 外径范围 | 6mm - 630mm | 可选外径规格 |
| 壁厚 | 0.5mm - 50mm | 标准及定制厚度 |
| 长度 | 6m - 12m 或定制 | 提供标准及定制长度 |
| 表面处理 | Annealed & Pickled, Bright Annealed, Polished | 多种表面处理选项 |
| 应用 | Food processing, chemical, pharmaceutical, architecture | 典型应用行业 |
| 温度范围 | -196°C to 925°C | 使用温度范围 |
| 耐腐蚀性 | 在温和环境中表现优异 | 对大气和食品酸具有良好的耐受性 |
| 可焊性 | 优异 | 无需焊后热处理 |
| 认证 | EN 10204 3.1, ISO 9001, PED, NACE MR0175 | 提供质量认证 |
| 包装 | 钢带捆扎，塑料端盖，木箱 | 标准出口包装 |
| MOQ | 1 ton | 最小起订量 |
304不锈钢管 - ASTM A312无缝与焊接管
304不锈钢管是全球工业应用中规定最广泛的奥氏体铬镍合金管材。这种多功能材料兼具卓越的耐腐蚀性和优异的成形性，使其成为食品加工设备、建筑结构和通用工业管道系统的首选。我们的304管材库存按照ASTM A312/A312M标准制造，服务于从制药生产到水处理设施等多元化领域，在中等腐蚀环境中提供可靠性能。
什么是304不锈钢管？
304不锈钢管是一种奥氏体铬镍合金管，含18-20%铬和8-10.5%镍，按照ASTM A312/A312M规范制造。该材料呈现面心立方晶体结构，在宽温度范围内保持稳定，提供优异的延展性和可焊性。该合金的钝化氧化铬层在暴露于氧气时自动再生，对大气腐蚀和多种化学环境提供持续保护。
304不锈钢管技术规格
我们的304管材符合ASTM A312/A312M-2021第5节化学成分要求：碳含量最高限0.08%，锰最高2.0%，磷最高0.045%，硫最高0.030%，硅最高0.75%，铬18.0-20.0%，镍8.0-10.5%。力学性能符合ASTM A312表2标准，最小抗拉强度515 MPa，最小屈服强度205 MPa，50mm内伸长率40%。材料密度在20°C时为7.93 g/cm³，100°C时热导率为16.2 W/m·K。
制造工艺与质量控制
我们通过两种主要方法生产304不锈钢管：根据ASTM A312第6节，采用无缝热挤压工艺生产NPS 1/8"至10"的规格；对于最大至48"的更大直径，采用TIG/等离子焊接工艺。每个生产批次均按照ASTM A312第9节要求计算的压力进行静水压测试，通常为设计压力的1.5倍。我们的质量管理体系保持ISO 9001:2015认证，并具备从炉号到最终检验的完整可追溯性。
表面处理选项
标准轧制表面（2B）提供光滑、中等反射的表面，适用于大多数工业应用。光亮退火表面通过按ASTM A312第7.3节控制的保护气氛热处理，提供增强的耐腐蚀性。电解抛光表面可达到Ra值低于0.4 μm，满足ASME BPE-2019对制药和生物技术系统的卫生要求。
尺寸公差
外径公差符合ASTM A312表3：外径至25mm的规格为±0.4mm，外径25-50mm为±0.75mm，更大直径为±1%。壁厚对于无缝管保持±10%公差，对于壁厚小于3mm的焊接管保持±0.15mm。按ASTM A312第8.2节测量时，直线度偏差每米长度不超过1.5mm。
跨行业应用
食品加工设施在产品接触管线、就地清洗系统和卫生输送应用中使用 304 管，因为该材料的非反应性表面可防止污染。建筑项目利用 304 管材制作扶手、结构支撑和装饰元素，受益于该合金的美观外观和极低的维护要求。水处理厂指定该牌号用于饮用水配送、反渗透系统和在 400°C 以下运行的化学加药管线。
化学加工应用
该材料适用于温和酸性环境，包括环境温度下浓度高达 20% 的醋酸，以及 50°C 下浓度低于 10% 的稀磷酸溶液。根据 NACE MR0175/ISO 15156 指南，含氢氧化钠浓度高达 50% 的碱性工艺流中，304 管适用于 80°C 以下的温度。
暖通空调和管道系统
商业建筑系统将 304 管整合用于冷冻水配送、冷凝水回水管线和压力高达 10 bar 的蒸汽应用。该材料的热膨胀系数为 17.2 × 10⁻⁶/°C，需要按照 ASME B31.9 建筑服务管道规范计算适当的膨胀节间距。
304 不锈钢管的优势
优异的焊接特性使得壁厚低于 6mm 时无需预热或焊后热处理即可制造，与更高合金牌号相比，安装成本降低约 30%。该材料在低温至 870°C 范围内保持机械性能，为各种热环境提供操作灵活性。成本效益使 304 成为基准不锈钢牌号，通常比 316L 低 15-20%，同时为 80% 的腐蚀应用提供足够的性能。
耐腐蚀性能
根据 ASTM G50 进行的大气暴露测试表明，在工业环境中腐蚀速率低于 0.02mm/年，在农村环境中低于 0.005mm/年。钝化膜在 pH 值 4 至 10 范围内保持稳定，但氯化物浓度超过 200 ppm 时，在 60°C 以上可能引发点蚀。
制造与连接
冷成型操作对退火材料可实现 2.5D 的弯曲半径而不开裂，符合 ASTM A999 管材弯曲标准。使用 ER308L 填充金属的气体钨极电弧焊（GTAW）在适当的保护气体（98% Ar + 2% N₂）防止碳化铬析出时，可产生超过母材强度的接头。
常见问题
最小起订量（MOQ）是多少？
我们的标准 MOQ 为每个尺寸和规格 500 kg，但对于定制尺寸，我们可以接受更小的数量并调整价格。我们区域仓库的库存尺寸发货无最小订单要求，为原型项目和维护需求提供灵活性。
你们提供材质测试证书吗？
每批货物均包含 EN 10204 Type 3.1 工厂测试证书，记录通过光学发射光谱法测定的化学成分、根据 ASTM E8 进行拉伸测试的力学性能，以及根据 ASTM A262 Practice E 的晶间腐蚀测试结果。可根据要求通过 SGS、TÜV 或 Lloyd's Register 进行额外的第三方检验。
典型的交货时间是多少？
常见壁厚系列（5S、10S、40S）的库存尺寸在 3-5 个工作日内从我们的配送中心发货。需要钢厂生产的定制尺寸根据订单量和当前生产计划，交货周期为 8-12 周。紧急需求可提供加急制造服务，需加收 15% 的溢价。
你们能切割成定制尺寸吗？
我们的加工厂使用自动化轨道锯提供精度为 ±1mm 的精密切割服务。我们提供端部加工，包括按 ASME B16.25 标准进行 37.5° 坡口加工、按 ASME B1.20.1 标准进行螺纹加工，以及用于机械连接系统的开槽加工。订单超过 200 kg 时，定制长度切割不收取额外费用。
获取 304 不锈钢管的竞争力报价
立即申请定制报价，享受我们钢厂直采带来的优势，省去中间商加价。我们的技术销售团队提供针对具体应用的推荐，确保您为项目需求指定最优的壁厚表和表面处理。我们在北美、欧洲和亚太地区保持战略库存，以支持准时制交付计划。
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评分与评价
David Thompson
United States
2025-07-11
Acceptable Quality with Minor Issues Resolved
Decent product with some initial concerns that were addressed. We ordered 5 tons of 304 welded pipe (3-inch Schedule 10S) for our municipal water treatment plant reverse osmosis system. Upon delivery inspection, we found that 3 pieces had weld discoloration indicating potential chromium depletion from improper heat input during fabrication. We documented this with photographs and contacted their quality team immediately. Within 48 hours, they arranged independent third-party testing through SGS which confirmed the welds met ASTM A312 intergranular corrosion requirements per Practice E testing. They also provided a 12% price reduction on the affected pieces as goodwill compensation. The material has been in service for 3 months handling chlorinated water at 6 bar pressure with no performance issues. I would suggest they implement more rigorous weld quality inspection before shipment to prevent similar concerns. Overall acceptable quality once the technical verification was completed, and their responsive problem-solving approach was professional.
Carlos Silva
Brazil
2025-07-21
Excellent Partner for South American Market
Long-term reliable supplier for our Brazilian operations. This is our 5th order over the past 14 months totaling over 40 tons of 304 pipe for various industrial projects. Consistency in quality and service has been exceptional - every shipment arrives with complete Portuguese-translated documentation and proper INMETRO compliance certificates required for Brazilian customs. Their São Paulo logistics partner ensures smooth delivery to our Campinas facility within 15 days of order placement. Recent 9-ton order of mixed sizes (1-inch to 4-inch Schedule 40) for our pharmaceutical client's clean utility systems arrived perfectly packaged with no transit damage despite the 8,000 km journey from Asian mill. Technical support team understands South American market requirements and provides valuable guidance on local code compliance. Pricing remains stable with transparent currency exchange policies. Looking forward to continued partnership as we expand into Argentina and Chile markets.
Chris Martin
Canada
2025-08-06
Decent Product for Chemical Processing
Good experience overall for our acetic acid handling system upgrade. We ordered 7 tons of 304 seamless pipe (1.5-inch Schedule 40, bright annealed finish) for our Ontario food processing facility dealing with 15% acetic acid at ambient temperature. The material meets ASTM A312 specifications and performed well in our initial corrosion testing with rates below 0.15 mm/year. Delivery took 19 days versus the quoted 14 days due to cross-border logistics delays at the Windsor-Detroit crossing, which caused some project scheduling challenges. However, the supplier provided weekly updates and worked with the freight forwarder to expedite customs clearance. The bright annealed surface finish provides enhanced corrosion resistance as specified. Overall, reliable quality for mild acid service applications. 4 stars because delivery timing impacted our installation schedule, though the material quality itself is excellent.
Ahmed Al-Hassan
United Arab Emirates
2025-09-01
Perfect for High-Temperature HVAC Systems
We ordered 10 tons of 304 welded pipe (DN100 and DN150, Schedule 10S) for our Dubai shopping mall chilled water distribution system operating at 8 bar pressure. Material certificates documented full ASTM A312 compliance with tensile strength tested at 545 MPa, exceeding the 515 MPa minimum requirement. The TIG welded seam quality was inspected using ultrasonic testing per ASTM E213 with 100% pass rate and no detectable defects above 2mm. We appreciated the technical consultation regarding thermal expansion calculations - their engineer provided detailed expansion loop spacing recommendations per ASME B31.9 considering our 15°C to 45°C operating range. Installation proceeded smoothly with excellent weld fusion using ER308L filler metal. Delivered to Jebel Ali port in 13 days with complete customs documentation prepared in advance. The material is performing flawlessly after 4 months of operation in our harsh desert climate with no signs of external corrosion.
William Taylor
Australia
2025-09-23
Solid Quality with Competitive Pricing
Good value proposition for our desalination plant maintenance requirements. We compared quotes from 4 Australian suppliers and 3 Asian importers, and their delivered price to Sydney was 18% below local suppliers while providing equivalent ASTM A312 certified material. The 4.5-ton order of 304 seamless pipe (2-inch and 3-inch Schedule 40) arrived with complete documentation including PMI test reports verifying chemistry. Minor issue with one bundle having slight surface staining from sea transport, but supplier immediately offered 8% credit on that portion without requiring return shipment. The material performed well in our chloride-containing process water application at 45°C. Overall, excellent balance of quality and cost for industrial applications. 4 stars because the surface staining required additional cleaning labor, though the resolution was handled professionally and fairly.
Robert Brown
United Kingdom
2025-10-14
Premium 304 Pipe for Architectural Applications
We ordered 6 tons of 304 bright annealed pipe (various sizes from 1-inch to 3-inch, Schedule 5S) for our London commercial tower handrail and balustrade project. Quality assessment exceeded expectations - material certificates showed carbon content at 0.06%, well below the 0.08% maximum, ensuring excellent weldability for our ornamental welding requirements. Surface finish was mirror-bright with Ra values measured at 0.25 μm, superior to the specified 0.4 μm maximum. We conducted bend testing per ASTM A999 and achieved 2D radius bends without any surface cracking or orange-peel effect. The aesthetic appearance after installation is outstanding with uniform reflectivity across all pieces. Delivered in protective foam sleeves to prevent scratching during transit. This is our 2nd architectural project using their material. Quality consistency makes specification decisions easy. Highly recommended for high-visibility architectural metalwork where appearance is critical.
Wei Chen
Singapore
2025-11-05
Reliable Long-Term Partner for HVAC Projects
Long-term partner for 304 stainless steel pipe supply in Southeast Asia region. This is our 7th order over the past 18 months for various commercial building HVAC systems. Consistency has been remarkable - every shipment maintains the same high quality standards with complete ASTM A312 compliance and proper mill test documentation. Their inventory management system allows us to place orders as small as 2 tons for urgent maintenance projects or as large as 25 tons for new construction, with the same attention to quality control. The Singapore warehouse stocks common sizes (1-inch to 4-inch Schedule 10S) enabling 48-hour delivery to our fabrication facility. Pricing remains competitive and stable despite market fluctuations. Technical support team understands tropical climate corrosion challenges and provides valuable application guidance. Looking forward to continued partnership as we expand into Malaysia and Indonesia markets.
Hans Mueller
Germany
2025-11-28
Good Value 304 Tubing for Food Processing
Good value for the price on our recent purchase. We compared quotes from 6 suppliers across Germany, Netherlands, and Poland, and their price was 12% lower than average while maintaining ASME BPE-2019 compliance for our dairy equipment project. The 5-ton order of electropolished 304 tube (1.5-inch OD, 1.5mm wall) met our Ra 0.38 μm surface finish requirement. However, delivery took 16 days versus the quoted 12 days due to customs processing delays at Hamburg port. The supplier proactively communicated the delay and provided daily tracking updates. Overall, the material quality is excellent for sanitary applications and the cost savings allowed us to stay within budget. 4 stars because the delivery timeline wasn't met as promised, though the communication during the delay was professional.
James Wilson
United Kingdom
2025-12-18
Outstanding Service and Fast Delivery
Excellent service experience from inquiry to delivery for our pharmaceutical plant expansion project. Communication was exceptional - technical sales team responded within 2 hours with detailed specifications and compliance documentation for EU PED requirements. They provided comprehensive guidance on selecting appropriate wall thickness for our 10-bar steam application. Delivery was impressive - 12 tons of 304 welded pipe (DN50 and DN80 sizes) arrived at our Southampton facility in just 9 days, well ahead of the 14-day estimate. Packaging was professional with wooden crates, plastic end caps, and moisture barriers that ensured zero transit damage. Each bundle included heat number traceability tags and EN 10204 3.1 certificates. The team also arranged customs clearance documentation proactively. This level of service sets them apart from other suppliers we've worked with in the European market.
Michael Johnson
United States
2026-01-02
Excellent Quality 304 Pipe for Seawater System
We ordered 8 tons of 304 stainless steel seamless pipe (2-inch Schedule 40, 6-meter lengths) for our offshore platform seawater cooling system. Material certificates showed chromium content at 18.4% and nickel at 8.9%, fully compliant with ASTM A312. We conducted hydrostatic testing at 3.5 MPa and all pieces passed without leakage. Surface finish was excellent 2B with no visible pitting or contamination. The passive layer quality was verified through ferroxyl testing. Delivered in 11 days to our Texas facility, 4 days ahead of the quoted schedule. This is our 4th order from this supplier. Quality has been consistently excellent across all shipments. Highly recommended for marine and water treatment applications where moderate corrosion resistance is required.
了解供应商
可定制
超低价
$2850
1-49 吨
基准价
$2725
50-99 吨
4.4% 优惠
$2660
≥100 吨
6.7% 优惠
价格有效期：随行就市
付款与交货
- 交期：
- 随报价一并确认
- 包装：
- 标准出口包装
- 样品：
- 可按需提供
