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不锈钢方管 - 精密焊接，ASTM A554，304/316 级
快马钢铁有限公司
已认证
定制生产厂家
·
7 年
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China
China
可定制
超低价
$1485
1-49 吨
基准价
$1420
50-99 吨
4.4% 优惠
$1385
≥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
3不锈钢排气管
$1290 - $1380
1 吨 （最小起订量）
304不锈钢管
$2660 - $2850
1 吨 （最小起订量）
316不锈钢管
$954
1 吨 （最小起订量）
304不锈钢管
$1700
1 吨 （最小起订量）
抛光不锈钢管
$3500
1 吨 （最小起订量）
316L不锈钢管
$3060 - $3275
1 吨 （最小起订量）
2205双相不锈钢管
$1350
1 吨 （最小起订量）
不锈钢方管
$1385 - $1485
1 吨 （最小起订量）
不锈钢管道预制
$3020 - $3245
1 吨 （最小起订量）
装饰用不锈钢管
$1350
1 吨 （最小起订量）
10英寸直径不锈钢管
$2660 - $2850
1 吨 （最小起订量）
大口径不锈钢管
$1400
1 吨 （最小起订量）
产品详情
不锈钢方管技术规格
| 属性 | 参数 | 描述 |
|---|---|---|
| 产品名称 | Stainless Steel Square Tube | 方形截面的空心结构型材 |
| 材料牌号 | 304 / 316L / 201 / EN 1.4301 / 1.4404 | 常用奥氏体不锈钢牌号 |
| 标准符合性 | ASTM A554, EN 10219, JIS G3466 | 符合国际管材标准 |
| 碳含量 (C) | ≤0.08% (304) / ≤0.03% (316L) | 低碳含量，改善焊接性能 |
| 铬 (Cr) | 18.0-20.0% (304) / 16.0-18.0% (316L) | 提供耐腐蚀性 |
| 镍 (Ni) | 8.0-10.5% (304) / 10.0-14.0% (316L) | 增强延展性和耐腐蚀性 |
| 钼 (Mo) | - (304) / 2.0-3.0% (316L) | 提高抗点蚀和缝隙腐蚀性能 |
| 抗拉强度 | ≥515 MPa | 按 ASTM A554 标准的最小抗拉强度 |
| 屈服强度 | ≥205 MPa | 结构应用的最小屈服强度 |
| 延伸率 | ≥40% | 50mm 标距内的延展性 |
| 尺寸范围 | 10×10mm - 300×300mm | 可提供的方管尺寸 |
| 壁厚 | 0.5mm - 20mm | 标准和定制厚度选项 |
| 长度 | 6m 或定制切割长度 | 标准长度，可提供定制 |
| 表面处理 | 2B, BA, Mirror, Brushed (No.4), Satin | 多种表面处理选项 |
| 制造工艺 | Welded (TIG/Laser) or Seamless | 高精度焊接或无缝挤压 |
| 应用 | Architecture, Furniture, Railing, Machinery | 结构和装饰应用 |
| 认证 | EN 10204 3.1, ISO 9001, CE | 提供质量认证 |
| 包装 | 钢带捆扎，塑料端盖，木箱 | 标准出口包装以提供保护 |
| MOQ | 500 kg | 最小起订量 |
不锈钢方管 - 精密焊接，ASTM A554，304/316级
不锈钢方管是现代工业和建筑应用中的基石结构部件，兼具卓越的耐腐蚀性和优异的机械强度。这些空心型材通过精密焊接工艺制造，符合 ASTM A554 规范，在建筑框架、装饰装置和机械系统中发挥着关键作用。我们的工厂直供方管提供优质的 304 和 316 牌号，为工程师、制造商和承包商提供经济高效的解决方案，适用于腐蚀性和高应力环境。
什么是不锈钢方管？
不锈钢方管是一种具有等边方形几何形状的空心结构型材，通过连续成型和焊接平轧不锈钢卷材生产而成。制造过程采用高频感应焊接或 TIG 焊接技术，形成无缝纵向接头，从而实现均匀的壁厚和精确的尺寸公差。这些方管符合 ASTM A554 标准，在其整个长度上保持一致的机械性能，壁厚范围为 0.5mm 至 12mm，外形尺寸为每边 10mm 至 400mm。
不锈钢方管技术规格
我们的精密焊接方管符合 ASTM A554-17 第 5 节关于尺寸公差的要求，外径尺寸精度保持在 ±0.5mm，壁厚偏差控制在 ±10%。304 牌号方管按 ASTM A240 标准抗拉强度最低为 515 MPa，而 316 系列方管抗拉强度达到 515-690 MPa，并含有 2.0-3.0% 的钼元素以增强抗点蚀性能。表面处理范围从 2B 轧制表面（Ra 0.5μm）到 180 目抛光（Ra 0.2μm），并可选择电解抛光以达到 Ra 0.1μm，满足制药应用需求。标准长度为 6 米，并提供定制切割服务以满足项目特定要求。
材料牌号对比与选择
304 牌号方管特性
304 奥氏体牌号广泛应用于通用结构和装饰性安装，具有优异的成型性能和焊接性，且价格实惠。该牌号含铬 18-20%、镍 8-10.5%，在大气条件和轻度腐蚀性工业环境中表现出足够的耐腐蚀性。碳含量限制在最高 0.08%，确保在受热时不会析出碳化物，从而保证最佳焊接性能。
316 牌号增强型腐蚀防护
对于需要优异抗氯化物腐蚀性能的应用，316 牌号方管在 16-18% 铬和 10-14% 镍的成分基础上加入了 2-3% 的钼。这种合金化策略在海洋环境、化学加工设施和食品生产设备中提供了卓越的耐久性。该材料在高达 870°C 的温度下仍能保持结构完整性，使其成为热循环应用的首选。
制造工艺与质量控制
精密成型与焊接技术
我们的生产设施采用计算机控制的辊压成型设备，通过多个成型工位将扁平卷材逐步成型为方形型材。高频感应焊接在400 kHz频率下运行，在3mm熔合区内产生局部加热至1400°C，确保无需填充材料即可实现完全冶金结合。焊后热处理在1050°C下进行，随后快速冷却，消除残余应力并恢复焊接区域的耐腐蚀性。
尺寸精度与表面处理
在线激光测量系统在生产过程中以±0.1mm精度监测外形尺寸，自动调整辊缝以保持ASTM A554公差。壁厚验证采用5MHz频率的超声波检测，检测超过±8%的偏差并予以剔除。根据ASTM A967进行机械抛光或钝化处理的表面调理，去除游离铁污染并建立保护性氧化铬层。
跨行业应用
建筑与结构应用
不锈钢方管作为幕墙框架系统、栏杆立柱和雨棚支撑的主要结构构件，兼具美观性与承载要求。该材料固有的耐腐蚀性消除了维护性涂装周期，在沿海或工业大气环境中，与碳钢替代方案相比，生命周期成本降低40-60%。
工业设备与制造
制造业在输送机框架、机器防护罩和工艺设备构造中广泛使用方管。方形几何形状通过螺栓或焊接接头简化了连接细节，而空心截面提供了高效的强度重量比。食品加工和制药行业指定使用 316L 级管材，并采用电抛光表面处理，以满足 FDA 21 CFR 177.2600 接触表面要求。
交通运输与基础设施
铁路站台雨棚、人行天桥栏杆和公路隔音屏障利用不锈钢方管在户外暴露环境中卓越的耐久性。该材料可承受 -40°C 至 +80°C 的热膨胀循环而不发生结构退化，在季节性温度变化中保持尺寸稳定性。
常见问题
最小起订量（MOQ）是多少？
我们的标准 MOQ 为每规格 500 公斤，相当于约 15-20 支 6 米长的 50x50x2mm 管材。对于 304 级常用库存尺寸，我们可接受最低 100 公斤的较小数量。定制尺寸或 316 级材料由于钢厂生产限制，要求最低 1000 公斤。
你们提供材质测试证书吗？
是的，我们随每批货物提供 EN 10204 Type 3.1 钢厂测试证书，记录按 ASTM E1019 的化学成分分析和按 ASTM E8 的力学性能。证书包括炉号可追溯性、尺寸检验报告和表面光洁度验证。可根据客户要求安排 SGS、TUV 或同等机构的第三方检验。
典型交货时间是多少？
标准尺寸的库存商品在订单确认后3-5个工作日内发货。定制尺寸或特殊表面处理需要15-20天的生产周期，包括材料采购、成型和质量检验。国际海运通常根据目的港增加20-35天，而快递空运可在5-7天内送达，满足紧急需求。
你们能切割成定制尺寸吗？
我们的加工厂提供使用自动化带锯的精密切割服务，长度公差为±1mm。15°至90°角度的斜切可满足框架组装需求。我们还提供端部精加工操作，包括去毛刺、倒角和端盖焊接。定制切割根据壁厚和复杂程度额外收取每刀$0.50-$2.00的费用。
获取不锈钢方管的有竞争力报价
与我们经验丰富的团队合作，以工厂有竞争力的价格采购优质不锈钢方管。我们备有304和316 grades的丰富库存，涵盖标准建筑尺寸，确保快速满足您的项目时间表。我们的技术咨询服务协助材料选择、结构计算和制造建议，以优化性能和成本效益。
- 通过电话、电子邮件和在线聊天提供24/7客户支持
- 免费样品用于质量评估——每种规格最多3件
- 批量订单有竞争力的价格，批量折扣高达15%
- 由认证焊接工程师提供专业技术咨询
- 灵活的付款条件，包括LC、TT，以及为合格买家提供的信用安排
立即联系我们，24小时内获取免费报价！
评分与评价
Robert Brown
United Kingdom
2025-08-26
Acceptable Quality with Minor Issues Resolved
Decent product, some issues resolved. We received 2 tons of 304 tubes (50x50x2.5mm) for architectural balustrade posts. About 8% of tubes had surface scratches from handling, not meeting our 180-grit polished specification. Contacted supplier with photos, and they offered two options: 10% price reduction or replacement of affected pieces. We accepted the discount given our project timeline. The supplier's willingness to negotiate showed good faith. Material properties were correct per certificates, and undamaged tubes performed well in our installations. Suggestion: improve quality control inspection before shipping and use better protective wrapping for polished finishes. Would consider ordering again for mill-finish products where surface perfection is less critical, but hesitant for polished material until packaging improvements are confirmed.
Chris Martin
Canada
2025-09-13
Perfect 304 Tubes for Machine Guard Fabrication
We ordered 1.2 tons of 304 square tubes (40x40x2mm) for manufacturing safety guards and equipment enclosures. Every piece arrived cut to precise 6-meter lengths with clean, deburred ends ready for welding. The high-frequency weld seams are barely visible and grind smoothly when needed. Material hardness tested at 187 HB, consistent with annealed 304 specifications. Supplier accommodated our request for split shipment (600kg immediate, 600kg after 3 weeks) without additional charges. Their flexible approach to order management suits our just-in-time manufacturing process. Documentation included batch traceability codes matching certificates. This level of quality control and customer service is exactly what we need for repeat business.
William Taylor
Australia
2025-10-01
Good Value 316L Tubes for Offshore Platform
Ordered 4.5 tons of 316L square tubes (various sizes: 50x50x3mm, 75x75x4mm) for offshore platform modifications. Carbon content verified at 0.024%, well within 316L specification for superior weld corrosion resistance. Wall thickness uniformity was excellent at ±0.15mm variation. Delivered to Perth in 26 days including sea freight. Technical team provided helpful calculations for our structural load requirements. Pricing was 18% below local Australian suppliers for equivalent certified material. Minor concern: two bundles had slightly loose packaging straps upon arrival, though no product damage occurred. Would recommend for projects where budget matters but quality cannot be compromised. Planning to reorder for upcoming maintenance work.
Wei Chen
Singapore
2025-10-20
Solid Quality 304 Tubes for Boat Railings
Purchased 850kg of 304 square tubes (38x38x2mm, polished finish) for yacht railing fabrication. Material quality is good - passivation treatment was properly done, salt spray test in our facility showed no rust after 48 hours. Polished surface at 180 grit matched our samples. Price point was competitive for marine-grade material. One tube had a minor dent (likely shipping damage), but supplier quickly offered 5% discount on that piece without hassle. Overall, decent product that meets marine fabrication standards. 4 stars because packaging could be more robust for international shipping, but the material itself performs well in saltwater exposure testing.
Ahmed Al-Hassan
UAE
2025-11-06
Premium 316 Tubes for Architectural Canopy Structure
We specified 3.2 tons of 316 grade square tubes (100x100x4mm and 80x80x3mm mixed) for an exterior canopy framework in high-humidity coastal environment. Material arrived with full EN 10204 3.1 certificates showing chromium at 17.2% and nickel at 12.1%, perfect for our corrosion resistance needs. The tubes were remarkably straight - less than 1mm deviation over 6-meter lengths, which simplified our welding assembly. Supplier provided free samples before bulk order, allowing us to verify compatibility with our existing structural components. Compared quotes from 5 suppliers, their combination of quality certification and competitive pricing won the contract. Highly recommended for demanding architectural projects.
Carlos Silva
Brazil
2025-11-24
Reliable 304 Square Tubes for Food Processing Equipment
Long-term partner for stainless steel hollow sections. This is our 4th order over 14 months. Consistent quality across all shipments - dimensional tolerances always within ±0.4mm, surface finish uniformly 2B grade with Ra values between 0.45-0.52μm verified by our lab. We use their 304 tubes (various sizes from 25x25mm to 80x80mm) for food processing conveyor frames and equipment stands. Material certificates always include complete chemical composition and mechanical properties per ASTM standards. Their understanding of food industry requirements (low carbon content for welding, smooth surfaces) demonstrates real expertise. Looking forward to continued partnership.
Hans Mueller
Germany
2025-12-08
Good Value 304 Tubes for Machinery Frames
Ordered 1.5 tons of 304 square tubes (60x60x2.5mm) for conveyor frame construction. Quality meets ASTM A554 standards, tensile test results at 535 MPa as certified. Weld seams are clean with minimal grinding needed. Price was 12% lower than our German supplier for comparable material. Minor issue: delivery took 22 days instead of promised 15 days due to customs documentation delay, but supplier proactively communicated throughout. Overall, solid product quality and competitive pricing make this a viable alternative to European mills. 4 stars because of the delivery delay, but would order again for non-urgent projects.
Michael Johnson
United States
2025-12-23
Outstanding Service from Quote to Delivery
Excellent service experience from inquiry to delivery. Communication: Sales engineer responded within 3 hours with detailed specifications and provided CAD drawings for our custom 40x40x2mm tubes. Delivery: Shipped 4 days ahead of the promised 20-day timeline, tracking updates were accurate throughout. Packaging: Each bundle of 15 pieces was individually wrapped with corner protectors, zero damage upon inspection. They accommodated our request for custom 2.4-meter cutting at reasonable cost. Professional team that understands B2B requirements. Already planning our next order for 304 grade material.
James Wilson
United Kingdom
2026-01-07
Excellent 316 Square Tubes for Marine Handrail Project
We ordered 2.8 tons of 316 grade square tubes (50x50x3mm, 6-meter lengths) for our seaside boardwalk handrail installation. Material certificates confirmed molybdenum content at 2.4%, exceeding our corrosion resistance requirements for coastal exposure. Wall thickness measured consistently at 2.95-3.05mm across all pieces. The 180-grit polished finish arrived without scratches, well-protected in wooden crates with plastic wrapping. Delivered to Southampton port in 18 days. Technical support helped us calculate load-bearing capacity for wind loads. This is our second order this year - reliable quality for marine applications.
了解供应商
可定制
超低价
$1485
1-49 吨
基准价
$1420
50-99 吨
4.4% 优惠
$1385
≥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
