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不锈钢304管供应商 – ASTM A312认证无缝管和焊接管
快马钢铁有限公司
已认证
定制生产厂家
·
7 年
·
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
ASTM 304不锈钢管
$1380
1 吨 （最小起订量）
409不锈钢管
$1290 - $1380
1 吨 （最小起订量）
316L不锈钢管
$3515 - $3765
1 吨 （最小起订量）
316不锈钢管
$954
1 吨 （最小起订量）
不锈钢管尺寸
$1290 - $1380
1 吨 （最小起订量）
316不锈钢管供应商
$2200
1 吨 （最小起订量）
单层不锈钢烟囱管
$1800
1 吨 （最小起订量）
奥氏体不锈钢管
$2660 - $2850
1 吨 （最小起订量）
304不锈钢管
$2660 - $2850
1 吨 （最小起订量）
6英寸直径不锈钢管
$1775 - $1900
1 吨 （最小起订量）
2205双相不锈钢管
$2035 - $2180
1 吨 （最小起订量）
250毫米不锈钢管夹
$1600
1 吨 （最小起订量）
产品详情
不锈钢304管的技术规格
| 属性 | 参数 | 描述 |
|---|---|---|
| 产品名称 | Stainless Steel 304 Pipe | 奥氏体铬镍不锈钢管 |
| 材料牌号 | 304 / EN 1.4301 / UNS S30400 / JIS SUS304 | 国际牌号对应 |
| 标准合规 | ASTM A312, ASTM A269, EN 10217-7, JIS G3459 | 符合主要国际标准 |
| 碳 (C) | ≤0.08% | 碳含量用于强度和焊接性 |
| 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% | 改善机械性能 |
| 硅 (Si) | ≤1.0% | 脱氧剂和强化剂 |
| 抗拉强度 | ≥515 MPa | 根据 ASTM A312 的最低抗拉强度 |
| 屈服强度 | ≥205 MPa | 最低屈服强度 |
| 伸长率 | ≥40% | 50mm 标距内的延展性 |
| 外径范围 | 6mm - 630mm | 可用的外径选项 |
| 壁厚 | 0.5mm - 50mm | 标准和定制厚度 |
| 长度 | 6m - 12m 或定制 | 标准和定制长度 |
| 表面处理 | 2B, BA, No.4, HL, Pickled | 多种表面处理选项 |
| 应用 | 食品加工、化工、建筑、汽车 | 典型应用行业 |
| 认证 | EN 10204 3.1, ISO 9001, PED, ASME | 提供的质量认证 |
| 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 |
不锈钢304管道供应商 – ASTM A312认证无缝管和焊接管
不锈钢 304 管道供应商解决方案在需要卓越耐腐蚀性和结构完整性的行业中发挥着关键作用。作为一种铬镍奥氏体合金，Type 304 是全球范围内最广泛指定的不锈钢牌号，在食品加工、制药制造、建筑应用和一般工业环境中提供卓越性能。本综合指南为寻求可靠钢厂直供合作关系的采购专业人士考察技术规格、质量认证和采购考量因素。
什么是不锈钢 304 管道？
不锈钢 304 管道是一种由 UNS S30400 奥氏体铬镍合金制造的中空圆柱形产品，含有 18-20% 铬和 8-10.5% 镍。该材料根据 ASTM A312/A312M 标准表现出最低 515 MPa 的抗拉强度，在从低温到 870°C 间歇使用温度的范围内具有优异的成形特性和焊接性。0.08% 最大值的低碳含量可防止焊接过程中的碳化物析出，使其成为卫生管材和焊后热处理不切实际的结构应用的首选。
不锈钢 304 管道技术规格
我们经过认证的不锈钢 304 管道库存符合 ASTM A312/A312M-21 第 5 节关于无缝和焊接配置的要求。标准尺寸范围为 1/8" 至 24" NPS，壁厚符合 ASME B36.19M 的 Schedule 5S 至 XXS。该材料在 20°C 时保持 7.93 g/cm³ 的密度，热导率为 16.2 W/m·K，在 0-100°C 之间的热膨胀系数为 17.2 μm/m·°C。可用的表面处理包括 2B 冷轧、BA 光亮退火和根据客户规格的 180-320 目机械抛光。
制造标准和认证
我们的生产设施保持 ISO 9001:2015 质量管理体系认证，并具备完整的可追溯性文件。每批钢管均按照 ASTM A312 第 9.1 节进行静水压试验，试验压力使用 S = (P × D) / (2t) 公式计算，其中 38°C 时的许用应力等于 138 MPa。工厂测试证书通过符合 EN 10204 3.1 要求的光学发射光谱法验证化学成分，碳含量验证低于 0.08%，铬在 17.5-19.5% 范围内，镍在 8.0-10.5% 范围内。
质量控制程序
无损检测规程包括：对无缝管按照 ASTM E213 进行超声波检测，对纵向焊缝按照 ASTM E1742 进行射线检测。涡流检测可验证深度达 0.8mm 的表面完整性，而正材料识别则使用校准至 NIST 可追溯标准的 X 射线荧光分析仪确认牌号准确性。
热处理验证
固溶退火在 1040-1120°C 下进行，随后快速水淬以获得奥氏体显微组织。硬度测试确认洛氏 B 值在 85-95 HRB 之间，并按照 ASTM E112 进行晶粒度验证，保持 ASTM No. 6 或更细，以确保最佳的力学性能和耐腐蚀性。
特定应用性能特征
304 型钢管在制药洁净室装置中得到广泛应用，在这些装置中，低于 0.8 μm 的表面粗糙度 Ra 值可防止细菌附着。该材料的钝化氧化铬层在氧化环境中会自发再生，从而在 pH 范围为 4-10 的饮用水系统、乳制品加工线和啤酒厂设备中提供免维护服务。
耐腐蚀性能
该合金表现出卓越的耐大气腐蚀性能，其点蚀当量数（PREN）为18，计算公式为PREN = %Cr + 3.3(%Mo) + 16(%N)。在65°C以下的无氯有机酸和碱性溶液中，腐蚀速率保持在0.1 mm/年以下。然而，在温度超过60°C且氯化物浓度持续超过200 ppm的应用中，需要考虑使用更高级别的替代材料。
焊接与制造指南
使用ER308L填充金属进行钨极气体保护焊（GTAW），可在热影响区保持耐腐蚀性而不发生敏化。推荐的层间温度保持在150°C以下，氩气保护气体纯度超过99.995%。焊后在50-60°C的8-12%硝酸溶液中进行30-60分钟的酸洗，按照ASTM A380程序恢复钝化层的完整性。
供应链与库存管理
我们战略布局的分销中心备有6米定尺和定制切割件的现货库存，公差符合ASTM A999 Table X1.1。准时制交付计划可配合项目进度，标准规格的交货周期为48-72小时，需要特定化学成分调整或非标准尺寸的钢厂直供定制订单为3-4周。
包装与运输
管道采用六角形捆扎配置，使用尼龙吊带，并按ISPM-15热处理要求用木箱保护出口货物。管端保护器防止螺纹损坏，而VCI（气相防锈）包装可在长达90天的海洋运输过程中保持表面状态。
常见问题
最小起订量（MOQ）是多少？
我们的标准起订量为500公斤（库存尺寸），并可根据项目特定需求灵活调整。在大宗采购承诺之前，可提供10-20公斤的样品数量用于质量评估和测试目的。
你们提供材质测试证书吗？
是的，我们每批货物都随附EN 10204 3.1工厂测试证书，记录化学成分、力学性能、热处理参数和无损检测结果。可根据客户要求安排SGS、TÜV或Lloyd's Register的第三方检验，需提前5-7个工作日通知。
典型的交货时间是多少？
库存商品在订单确认后48小时内发货。需要钢厂生产的定制规格遵循25-35天的制造周期，加上10-15天的国际物流时间。加急处理可通过附加费用安排将时间缩短30%。
你们能按定制尺寸切割吗？
我们的精密切割服务可加工100毫米至12米的长度，使用自动带锯，公差为±1毫米。可提供按ASME B1.20.1进行的坡口、螺纹加工和端面加工操作，并根据要求提供尺寸认证。
获取不锈钢304管材的竞争力报价
与经过认证的不锈钢304管材供应商合作，在整个采购周期中享受钢厂直销价格和技术支持。我们的冶金工程团队提供材料选择指导、腐蚀分析和应用特定建议，以优化性能和生命周期成本。请索取详细报价，包括化学成分保证、力学性能认证以及针对您特定行业要求的合规文件。
- 通过电话、电子邮件和在线聊天提供全天候客户支持
- 提供免费样品用于质量评估，并加快发货
- 批量订单具有竞争力的价格，并提供批量折扣结构
- 关于材料选择和应用工程的专业技术咨询
- 全面的售后支持，包括安装指导与故障排除
- 灵活的付款条件，包括信用证和按进度付款选项
立即联系我们，24小时内获取免费报价，并讨论我们的认证不锈钢304管道解决方案如何满足您的项目规格！
评分与评价
Wei Chen
Singapore
2025-07-18
Acceptable Quality with Minor Surface Issues Resolved
Decent product overall with some initial concerns that were addressed. We ordered 7 tons of 304 welded pipe (3" Schedule 10S, BA finish) for clean utility systems. Upon receipt inspection, we found approximately 15% of pieces had minor surface scratches on the BA finish that didn't meet our Ra < 0.4 μm specification for pharmaceutical-grade applications. Contacted supplier immediately with photographic documentation and surface roughness measurements. Their quality team responded within 48 hours, acknowledged the issue, and offered three solutions: full replacement, partial credit, or re-polishing at their facility. We chose replacement for affected pieces which arrived within 12 days at no additional cost. Replacement batch was flawless with Ra values averaging 0.32 μm. Chemical composition and mechanical properties met ASTM A312 requirements throughout. Would suggest they implement stricter final inspection protocols for BA finish products to catch such issues before shipment. Material performance in service has been satisfactory for our potable water systems.
John Smith
United States
2025-08-17
Reliable Repeat Supplier for Structural Applications
Long-term partner for structural grade 304 pipe. This is our 11th order over the past 2 years covering various architectural and structural projects. Consistency has been remarkable - dimensional tolerances always within ASTM A999 Table X1.1 limits, surface quality uniform across batches, and documentation complete with full traceability. Recent 14-ton order (4" to 10" Schedule 40, cut to custom lengths from 1.2m to 4.8m) demonstrated their precision cutting capabilities - all pieces within ±1mm tolerance using automated band saws. Mill test certificates consistently show mechanical properties exceeding minimums (typical tensile 570 MPa vs. 515 MPa required). Their just-in-time delivery program has been crucial for our project scheduling - 48-hour turnaround on stock items allows us to minimize inventory costs. Pricing structure with volume discounts makes them cost-competitive with domestic mills. Looking forward to continued partnership as we expand our stainless steel fabrication division.
Carlos Silva
Brazil
2025-08-31
Good Value Schedule 40 Pipes for Brewery Equipment
Good value for the price on our brewery expansion project requiring 9 tons of 304 welded pipe (2" and 3" Schedule 40, 2B finish). We compared quotes from 5 suppliers across South America and Asia, and their FOB price was competitive at 7% below regional distributors while maintaining certified quality. Material certificates showed compliance with ASTM A312 chemistry requirements. Surface finish was uniform 2B suitable for our brewery process lines operating at pH 4-6. Slight delay in production - initial lead time quoted as 30 days but actual manufacturing took 37 days, though they communicated the delay 2 weeks in advance allowing us to adjust installation schedule. Packaging was adequate with VCI wrapping maintaining surface condition during 45-day ocean transit to Santos port. Overall, reliable source for food processing applications where cost management is important. 4 stars because production timeline exceeded quote, though final quality met our sanitary piping requirements.
Ahmed Al-Hassan
United Arab Emirates
2025-09-20
Perfect Documentation and Quality for HVAC Project
Excellent experience sourcing 304 welded pipe (1" to 3" Schedule 10S, 6-meter lengths) for our commercial HVAC installation totaling 6 tons. Communication was outstanding - technical team provided complete welding guidelines including GTAW procedures, ER308L filler specifications, and post-weld pickling instructions per ASTM A380 within 24 hours of inquiry. Material arrived with comprehensive documentation: EN 10204 3.1 certificates, heat treatment verification showing solution annealing at 1065°C, hardness test results (91 HRB), and grain size confirmation (ASTM No. 6). We verified chemistry using portable OES analyzer - results matched certificates exactly. Delivered in 10 days with wooden crate packaging meeting ISPM-15 requirements for our UAE import regulations. Sales support helped navigate customs documentation smoothly. This level of technical expertise and documentation quality is rare in the Middle East market. Will definitely use for future commercial construction projects.
Chris Martin
Canada
2025-10-08
Solid Quality 304 Welded Pipe for General Industrial Use
Solid quality on our 10-ton order of 304 welded pipe (2" to 4" Schedule 40) for general industrial piping systems. We compared quotes from 4 North American distributors, and their mill-direct pricing was 12% lower while quality met ASTM A312 requirements. Radiographic inspection reports per ASTM E1742 showed acceptable weld quality with no linear indications exceeding acceptance criteria. Chemical composition verified within specification ranges (18.1% Cr, 8.4% Ni, 0.072% C). Minor packaging issue - two bundles had loose nylon slings that required re-securing before unloading. Surface condition was good 2B finish suitable for our painted applications. Delivery took 28 days as promised. Overall, reliable supplier for standard industrial specifications where premium surface finish isn't critical. 4 stars because packaging could be improved, though product quality met our requirements for process piping applications.
William Taylor
Australia
2025-10-28
Premium Quality Seamless 304 for Offshore Platform
We ordered 18 tons of ASTM A312 TP304 seamless pipe (6" and 8" Schedule 80, random lengths) for our offshore platform seawater cooling system. Quality assessment exceeded expectations - ultrasonic testing per ASTM E213 showed zero reportable indications across all pieces. Material certificates documented tensile strength at 585 MPa (specification minimum 515 MPa) and yield strength at 290 MPa, providing excellent safety margins. Eddy current testing verified surface integrity to 1.2mm depth. We conducted additional corrosion testing in synthetic seawater (3.5% NaCl at 25°C) - corrosion rate measured 0.04 mm/year, well below our 0.1 mm/year threshold. Surface finish was flawless 2B with protective oil coating. This is our 2nd major offshore order. Quality has been consistently superior to other Asian suppliers we've used. Highly recommended for marine applications requiring maximum reliability and corrosion resistance.
Robert Brown
United Kingdom
2025-11-18
Reliable Long-Term Partner for Architectural Stainless Steel
Long-term partner for architectural grade 304 pipe and tube. This is our 9th order over the past 18 months for various building facade and handrail projects. Consistency has been exceptional - every shipment maintains identical surface quality (180 grit mechanical polish) and dimensional tolerances within ±0.5mm on cut lengths. Their understanding of architectural specifications saves us significant specification review time. Recent 5-ton order (3" and 4" Schedule 10S, 180 grit finish, cut to 2.4m and 3.0m lengths) arrived with beveled ends per our standing instructions without needing to specify again. Mill test certificates always include complete traceability with heat numbers. Pricing remains competitive with transparent volume discount structure. Looking forward to continued partnership as we expand into more commercial construction projects requiring certified stainless steel components.
Hans Mueller
Germany
2025-12-08
Good Value A312 304 Pipes for Industrial Equipment
Good value for the price on our 12-ton order of 304 welded pipe (various sizes from 1" to 6" Schedule 40). We compared quotes from 6 suppliers across Europe and Asia, and their price was 8% lower than European mills while maintaining acceptable quality standards. Material certificates confirmed chemistry within specification ranges. Minor issue with delivery - original lead time quoted as 25 days but actual delivery took 32 days due to logistics delays they communicated proactively. Surface finish on 2B cold-rolled was uniform with occasional minor scratches that didn't affect our machining applications. Overall, solid supplier for non-critical industrial applications where cost optimization is important. 4 stars because delivery timeline exceeded initial promise, though quality met our requirements for general machinery components.
James Wilson
United Kingdom
2025-12-23
Outstanding Service and Documentation for Food Processing Line
Excellent service experience from inquiry to delivery for our dairy processing expansion. Communication was exceptional - technical team responded within 2 hours with detailed specifications for 304 welded pipe (4" Schedule 5S, BA finish) suitable for CIP systems. They provided welding procedure specifications for ER308L filler metal and recommended interpass temperatures below 150°C. Delivery was 3 days ahead of the promised 14-day timeline despite custom BA finish requirements. Packaging used hexagonal bundling with protective end caps and nylon slings - no damage during transport. EN 10204 3.1 certificates included grain size verification (ASTM No. 7) and hardness values (88 HRB). Sales engineer visited our site post-delivery to verify installation procedures. Professional support throughout the entire procurement cycle made this our smoothest stainless steel purchase in 5 years.
Michael Chen
Singapore
2026-01-07
Excellent Quality 304 Seamless Pipes for Pharmaceutical Project
We ordered 8 tons of ASTM A312 304 seamless pipe (2" Schedule 10S, 6-meter lengths) for our cleanroom pharmaceutical installation. Material certificates showed carbon content at 0.065%, chromium at 18.2%, fully compliant with ASTM A312 requirements. We conducted PMI testing using XRF analyzer and surface roughness measurements - Ra values averaged 0.6 μm, exceeding our 0.8 μm specification. Internal bore was exceptionally clean with no visible oxidation. Hydrostatic test reports at 3.5 MPa were included. Delivered in 11 days, packaged in wooden crates with VCI wrapping that kept surfaces pristine during ocean freight. This is our 4th order from this supplier. Quality has been consistently excellent across all batches. Highly recommended for sanitary and pharmaceutical applications requiring superior surface finish.
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
