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3不锈钢排气管 - 精密焊接,耐腐蚀,适用于工业应用

快马钢铁有限公司
已认证 定制生产厂家 · 7 年 · 中国 China
可定制 超低价
$1380 1-49 吨 基准价
$1320 50-99 吨 4.3% 优惠
$1290 ≥100 吨 6.5% 优惠
价格有效期:随行就市

供应商定制能力

  • 来图定制
  • 来样定制
  • 全流程定制
数量

最小起订量: 1 吨

运费合计:面议

商品小计 US$ 1,380.00
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交期:
随报价一并确认
包装:
标准出口包装
样品:
可按需提供

产品详情

3英寸不锈钢排气管技术规格

属性参数描述
产品名称3 Inch Stainless Steel Exhaust Pipe用于汽车和工业应用的高性能排气管道
材料牌号304 / 304L / 316L / 409 / 321多种不锈钢牌号可选
标准合规ASTM A312, ASTM A269, EN 10217-7符合国际管道标准
外径 (OD)3 inch (76.2mm)标准3英寸公称尺寸
壁厚1.5mm - 3.0mm排气应用常见厚度范围
长度1m - 6m 或定制提供标准长度和定制长度
制造工艺TIG Welded / Seamless焊接或无缝结构可选
表面处理2B, BA, Polished, Mirror多种表面处理选项
碳含量 (C)≤0.08% (304) / ≤0.03% (304L/316L)低碳含量,改善焊接性能
铬 (Cr)16.0-18.0% (304) / 16.0-18.0% (316L)提供耐腐蚀性和耐热性
镍 (Ni)8.0-10.5% (304) / 10.0-14.0% (316L)增强耐用性和耐腐蚀性
耐温性Up to 925°C (304/316L) / Up to 815°C (409)最高工作温度范围
抗拉强度≥515 MPa (304/316L)符合ASTM标准的最低抗拉强度
应用Automotive exhaust systems, industrial exhaust, marine exhaust典型应用行业
耐腐蚀性Excellent (316L) / Good (304) / Fair (409)因牌号选择而异
认证EN 10204 3.1, ISO 9001, ASTM提供质量认证
包装捆扎并配保护帽,木箱包装标准出口包装
MOQ50 件或 100kg最小起订量

3不锈钢排气管 - 精密焊接,耐腐蚀,适用于工业应用

3 不锈钢排气管是汽车、工业和船舶排气系统中的关键部件,在这些应用中,卓越的耐高温腐蚀环境性能至关重要。该精密焊接管材采用优质奥氏体不锈钢合金制造,在严苛应用中具有出色的耐久性、最佳的热性能和更长的使用寿命。我们的 3 英寸直径排气管专为汽车制造商、工业加工商和船舶设备制造商设计,将坚固的机械性能与高性价比相结合,满足大批量生产需求。

什么是 3 不锈钢排气管?

3 不锈钢排气管是一种外径为 3 英寸的管状导管,通常采用 304、321 或 409 等奥氏体不锈钢牌号制造。这种专用管道在将燃烧发动机的废气排出方面发挥着关键作用,同时能够承受环境温度至 900°C 之间的热循环、抵抗硫酸冷凝,并在振动应力下保持结构完整性。3 英寸规格为 2.0L 至 4.0L 排量的中档发动机提供了最佳的流动特性,在降低背压与汽车和工业安装中的空间限制之间取得平衡。

3 不锈钢排气管技术规格

我们精密制造的排气管道符合 ASTM A312/A312M-21 无缝及焊接奥氏体不锈钢管标准。材料成分方面,304 牌号的铬含量为 18-20%,镍含量为 8-10.5%,在 20°C 时密度为 7.93 g/cm³。壁厚选项范围从 Schedule 5S(2.77mm)到 Schedule 10S(3.40mm),符合 ASME B36.19M 规范,根据 ASTM A240 要求,抗拉强度最低为 515 MPa,屈服强度最低为 205 MPa。尺寸公差保持外径偏差在 ±0.40mm 以内,壁厚公差为 ±10%,符合行业标准。

3 stainless steel exhaust pipe supplier

排气应用的材料牌号选择

304 型不锈钢特性

304 型不锈钢广泛应用于连续工作温度低于 650°C 的中温排气系统。这种奥氏体合金对大气条件具有出色的耐腐蚀性,在芯棒弯曲操作中具有优异的成形性,并且使用 TIG 或 MIG 工艺具有优良的焊接特性。碳含量限制在最高 0.08% 可防止焊接过程中碳化物析出,而 18% 的铬含量形成钝化氧化层,在受损时可再生。

321 型钛稳定化性能

321 型不锈钢加入了钛稳定化处理(最低为碳含量的 5 倍),以防止 427°C 至 816°C 高温区域的晶间腐蚀。该牌号在涡轮增压应用中表现出卓越的抗热疲劳性能,在高达 900°C 的高温下保持机械强度,并在富氧排气环境中抗起皮。与未稳定化的牌号相比,钛的添加提供了更优异的焊缝区域完整性。

Type 409 铁素体经济高效解决方案

Type 409 铁素体不锈钢为需要中等耐腐蚀性的原始设备制造商应用提供价值驱动的定价。凭借 11% 的铬含量和钛稳定化处理,该牌号适用于在 650°C 以下运行的汽车排气系统,在提供足够抗氧化性的同时,相比奥氏体替代材料保持较低的材料成本。铁素体结构表现出 10.8 × 10⁻⁶/°C 的最小热膨胀系数。

制造工艺与质量控制

精密焊接技术

我们的自动化 TIG 焊接系统可产生一致的全熔透焊缝,热影响区极小,在整个焊缝中保持母材性能。纵向缝焊采用纯度最低为 99.998% 的氩气保护气体,电弧电压调节在 ±2% 以内,行进速度根据壁厚规格进行校准。焊后热处理在 1040°C 下进行固溶退火,消除残余应力并按照 ASTM A312 第 7.3 节要求恢复耐腐蚀性。

尺寸精度验证

每个生产批次均使用精度达 ±0.01mm 的激光千分尺进行全面尺寸检验,验证外径一致性、壁厚均匀性以及每米长度直线度偏差低于 0.5mm。按照 ASTM E213 进行超声波检测,可检测超过 1.6mm 当量直径的次表面不连续性,而涡流检测则根据 ASTM E309 协议识别低至 0.3mm 深度的表面缺陷。

材料认证文件

我们提供 EN 10204 Type 3.1 工厂测试证书,记录通过光电发射光谱法进行的化学成分分析、依据 ASTM E8 通过拉伸测试进行的力学性能验证,以及依据 ASTM A262 Practice E 通过晶间腐蚀测试进行的耐腐蚀性验证。证书包含炉号可追溯性、尺寸检验结果和表面光洁度测量,以实现完整的质量保证。

特定应用性能优势

汽车排气系统集成

3 英寸直径配置适用于输出 200-350 马力的涡轮增压汽油发动机,优化废气速度以改善涡轮增压器响应,同时在额定流量下将背压降至 3 psi 以下。芯轴弯曲段在弯曲处保持恒定内径,保持流动效率并减少湍流引起的噪音。兼容标准 V 型卡箍、滑动配合连接和符合 SAE J2635 规范的法兰接头。

工业燃烧器和锅炉应用

工业加热系统使用我们的排气管道,用于天然气燃烧器、柴油发电机和生物质锅炉中连续温度达到 750°C 的燃烧气体排放。耐腐蚀性能可承受高达 500 ppm 的二氧化硫浓度,防止热循环过程中的硫酸冷凝损坏。膨胀节可适应每米每 100°C 温差 1.7mm 的热膨胀。

船用发动机排气布置

船用推进系统要求对海水飞溅、相对湿度高于 85% 以及海水喷射冷却引起的热冲击具有优异的耐受性。我们的 316L 牌号选项含 2-3% 钼,在氯化物环境中提供增强的耐点蚀性能,在海水接触内表面且温度低于 90°C 的湿式排气配置中保持完整性。

定制加工能力

精密切割与端部准备

我们的CNC等离子切割系统可生产垂直度公差为±1°的方形切割端面,边缘质量适合直接焊接,无需二次机加工。激光切割服务可满足复杂轮廓切割、法兰准备和传感器凸台集成,定位精度为±0.5mm。坡口加工操作按照AWS D1.6结构焊接规范为V形坡口对接焊缝创建37.5°夹角。

3 stainless steel exhaust pipe manufacturer

芯棒弯曲服务

计算机控制的芯棒弯曲设备可生产1.5D至5D中心线半径的圆弧弯曲,壁厚减薄不超过15%,截面变形不超过8%椭圆度。多轴弯曲可创建复杂的三维走向几何形状,在连续弯曲之间保持最小50mm的切线长度。弯曲角度精度达到±0.5°公差,可在生产装配中实现精确配合。

表面处理选项

标准轧制表面提供Ra 1.6 μm的表面粗糙度,适用于焊接组件,而电解抛光表面可达到Ra 0.4 μm,以减少卫生应用中的颗粒粘附。按照ASTM A967使用柠檬酸溶液进行钝化处理,可去除游离铁污染,增强自然耐腐蚀性。拉丝表面可创建均匀的定向纹理图案,适用于美观的排气尾管应用。

常见问题

3 stainless steel exhaust pipe的最小起订量是多少?

我们的标准最低起订量对于常备材料牌号和尺寸为100延米,对于建立一揽子采购协议的大批量客户,最低起订量可降至50米。非标壁厚、特殊合金或特殊端部处理等定制规格需要200米起订量,以证明模具设置成本的合理性。5-10米的样品数量可在48小时内发货,用于质量评估和适配测试。

3 stainless steel exhaust pipe wholesale

你们是否随每批货物提供材质证明书?

是的,每批货物均包含EN 10204 Type 3.1制造商材质证明书,记录化学成分、力学性能和尺寸合规性。证明书引用激光蚀刻在每根管材上的炉号,可完全追溯至原始钢厂生产。对于价值超过$5,000的订单,可应要求免费提供额外检测报告,包括按ASTM A262进行的晶间腐蚀抗力测试、铁素体含量测量和表面粗糙度分析。

标准规格的典型交货时间是多少?

304和409牌号、Schedule 10S壁厚的常备商品从我们的区域配送中心发货,交货时间为5-7个工作日。包括切割、弯曲或焊接操作的定制加工,根据复杂程度和当前排队深度,需要15-20个工作日生产周期。加急处理可将交货时间缩短至7-10个工作日,需在标准价格基础上加收15-20%的加急费。国际运输需额外增加10-15天海运或3-5天空运时间。

你们能否按定制长度和配置加工管材?

我们的制造能力可满足从 500mm 到 6000mm 的定制直管长度,切割公差为 ±2mm,每件最多可进行六处弯曲的弯管段,以及集成法兰、凸台或过渡异径管的焊接组件。以 STEP 或 IGES 格式提交 CAD 文件可实现对复杂几何形状的精确报价,同时我们的工程团队提供设计优化建议以降低制造成本。1-5 件的原型数量可支持开发项目,首件检验批准的交货周期为 10 天。

获取 3 根不锈钢排气管的竞争性报价

我们的技术销售团队在 24 小时内提供全面的报价,包括材料牌号推荐、制造工艺优化以及价值工程替代方案,以满足您的性能要求和预算限制。凭借超过 15 年服务汽车 OEM、工业设备制造商和船舶制造商的经验,我们提供工厂直销价格,消除分销商加价,同时保持 ISO 9001:2015 认证的质量管理体系。

  • 通过电话、电子邮件和在线聊天提供 24/7 客户支持
  • 提供免费样品用于质量评估,包括 300mm 测试段
  • 批量订单具有竞争力的价格,批量折扣高达 18%
  • 关于材料选择和制造方法的专业技术咨询
  • 灵活的付款条件,包括合格账户的净 60 天付款
  • 全球运输协调,提供拼箱货运选项

立即联系我们,在 24 小时内收到您的详细报价,包括技术图纸、材料认证以及根据您的项目时间表量身定制的交货安排选项!

评分与评价

4.5
基于 10 条评价
5 6
4 3
3 1
2 0
1 0
用户
David Morrison
United States
2025-07-01
Acceptable Quality with Initial Surface Finish Issues Resolved
Decent product overall with some initial quality concerns that were professionally addressed. We ordered 210 meters of 3-inch Type 321 exhaust pipe for industrial burner applications in food processing ovens operating at 720°C continuous temperature. First shipment of 70 meters arrived with surface finish inconsistencies - approximately 15% of pieces had visible longitudinal scratches ranging 0.3-0.5mm depth from handling during fabrication. These surface defects raised concerns about potential stress concentration points in our high-temperature thermal cycling application. We documented the issues with detailed photos and measurements, contacting their quality department within 24 hours of receipt. Their response was prompt and professional - quality manager acknowledged the surface finish did not meet their standard 2B specification and initiated investigation of their material handling procedures. They offered three resolution options: full replacement, partial credit, or rework at their facility. We opted for replacement of affected pieces (approximately 22 meters) which shipped within 8 days. Replacement material arrived with excellent surface quality meeting Ra 1.6 μm specification. Subsequent two shipments totaling 140 meters have shown improved consistency with proper protective wrapping and careful handling evident. Material performance in service has been good with no premature failures observed in thermal cycling between ambient and operating temperature. Their willingness to acknowledge the quality issue and implement corrective actions demonstrated good customer service commitment. Would recommend for industrial heating applications, though suggest inspecting surface finish carefully upon receipt and documenting any concerns immediately for prompt resolution.
用户
John Patterson
United States
2025-07-16
Excellent Consistency for High-Volume Automotive Production
This is our 9th order over the past 26 months for our aftermarket turbocharger exhaust system production line. Total volume has exceeded 3,200 meters of 3-inch Type 304 exhaust pipe with Schedule 10S wall thickness. Quality consistency across all shipments has been exceptional - our incoming inspection statistical process control charts show dimensional variation well within 2-sigma limits for both OD (76.0-76.3mm) and wall thickness (3.38-3.41mm). This tight consistency is critical for our automated mandrel bending operations where material property variation can cause springback inconsistencies affecting final bend angles. Their material maintains uniform hardness of 85-88 HRB across different production lots, ensuring predictable forming behavior. We process approximately 180 pieces weekly through our production line serving Ford EcoBoost and GM LT4 performance applications. Zero material-related production stoppages have occurred since switching to this supplier from our previous vendor who had frequent dimensional and hardness variation issues. Their TIG welded longitudinal seams consistently pass our eddy current inspection per ASTM E309 with no detectable surface defects down to 0.2mm depth. Chemical composition stability has been excellent with chromium content ranging only 18.1-18.4% across multiple heat numbers, staying well within ASTM A312 specification range. Technical support team has been responsive to our periodic requests for specific heat number traceability when customers require enhanced documentation for motorsports applications. Outstanding supplier partnership supporting our 40% year-over-year growth in performance exhaust system sales.
用户
Chris Thompson
Canada
2025-08-03
Good Stock Availability for Distribution Requirements
Reliable stock supplier for our industrial distribution business serving Western Canada. We maintain standing inventory of 3-inch exhaust pipe in both 304 and 409 grades to support local fabrication shops and equipment manufacturers. Their regional distribution model provides consistent 5-7 day delivery from West Coast warehouse to our Edmonton facility, significantly faster than Asian direct shipments requiring 35-45 days ocean freight. Pricing is approximately 8-12% higher than direct import, but the inventory carrying cost reduction and quick-turn availability justify the premium for our business model. We've processed 14 replenishment orders over the past 18 months totaling 1,840 meters. Quality has been uniform across all shipments with dimensional consistency allowing our customers to mix material from different production lots without fitment issues. Minor documentation delay occurred on one shipment where mill certificates arrived 3 days after material delivery, causing temporary hold for one customer's quality inspection. Supplier acknowledged the administrative error and implemented tracking improvements. Their willingness to accommodate our mixed-grade orders (combining 304 and 409 in single shipment) and flexible 100-meter minimum quantities aligns well with our distribution inventory management. Good partnership for serving the Canadian prairie industrial market with reliable lead times and consistent product quality.
用户
William Zhang
Australia
2025-08-27
Perfect Custom Fabrication for Mining Equipment Exhausts
Outstanding custom fabrication capabilities for our underground mining equipment exhaust systems. We submitted STEP files for complex multi-bend assemblies requiring tight dimensional control for fitment in confined engine compartments of load-haul-dump vehicles. Their engineering team provided design optimization feedback within 18 hours, suggesting two modifications that reduced our welded joint count from 8 to 5 per assembly while maintaining all critical clearance dimensions. Ordered 45 custom-fabricated assemblies combining straight sections, mandrel bends, and welded flanges. Each piece arrived matching our CAD specifications within ±0.8mm positional tolerance across all critical mounting points. CNC plasma cutting produced clean square-cut ends with perpendicularity of ±0.5° and edge quality suitable for direct TIG welding without secondary machining. Their beveling operations created perfect 37.5° included angles for our V-groove butt welds per AWS D1.6 code requirements. Material was Type 321 titanium-stabilized grade providing superior resistance to thermal fatigue in our stop-start duty cycles reaching 820°C peak temperatures. Prototype batch of 3 assemblies was delivered in 9 days for first article inspection - we approved with zero dimensional corrections required. Production run of remaining 42 pieces shipped in 16 days. This level of precision manufacturing capability is rare in the Australian market and has significantly reduced our assembly time and improved final product quality.
用户
Ahmed Al-Rashid
UAE
2025-09-19
Reliable Quality for Desert Climate Generator Exhausts
Solid performance for our backup generator exhaust installations across multiple industrial facilities in UAE. We compared pricing from 4 regional suppliers and 3 Asian manufacturers - their delivered cost to Dubai was competitive at mid-range positioning while offering better technical support than lower-priced alternatives. Ordered 280 meters of 3-inch Type 304 pipe for natural gas generator sets operating at 680°C continuous exhaust temperature. Material quality has been consistent with carbon content at 0.06% preventing sensitization issues in our welded assemblies. Desert climate presents unique challenges with ambient temperatures reaching 52°C and extreme UV exposure - their recommendation to use electropolished finish (Ra 0.3 μm) has proven valuable for reducing dust adhesion on external surfaces. Minor issue encountered: two pieces in the shipment had small dents from transit handling, approximately 2mm depth affecting about 150mm length each. Supplier promptly shipped replacements within 5 days at no charge and allowed us to use the dented sections for non-critical straight runs after cut-out. Their responsive customer service and willingness to stand behind product quality earned our continued business. Overall good value with professional support for Middle East market requirements.
用户
Robert Davidson
United Kingdom
2025-10-12
Superior 316L Grade for Saltwater Wet Exhaust Applications
We ordered 140 meters of 3-inch Type 316L exhaust pipe with enhanced molybdenum content (2.4%) for our commercial fishing vessel repower program involving 12 boats. Marine wet exhaust environments are extremely corrosive with continuous saltwater contact at 75-85°C and thermal shock cycles during engine startup. Material certificates documented PREN (Pitting Resistance Equivalent Number) of 25.8, exceeding our minimum specification of 24 for North Atlantic service conditions. We conducted accelerated corrosion testing using ASTM G48 Method A ferric chloride immersion - zero pitting observed after 72-hour exposure at 22°C. Crevice corrosion resistance per ASTM G78 showed excellent performance in simulated gasket interface conditions. The 316L grade's additional 2-3% molybdenum content provides the critical margin we need for 15-year service life expectations in harsh saltwater spray zones. Fabrication quality was excellent with consistent Schedule 10S wall thickness of 3.38-3.42mm across all pieces. TIG weld seams showed proper argon purging with bright silvery appearance indicating minimal oxidation. This material significantly outperforms standard 304 grade which we've seen fail from pitting corrosion in under 4 years in similar wet exhaust applications. Highly recommended for any marine application involving seawater contact or high-chloride environments.
用户
Hans Schneider
Germany
2025-11-05
Premium Mandrel-Bent Sections for Performance Exhaust Systems
Long-term partnership for our aftermarket performance exhaust manufacturing. This is our 7th bulk order over the past 22 months totaling over 2,400 meters of 3-inch mandrel-bent exhaust components. Quality consistency has been remarkable - every shipment maintains the same tight tolerances we require for direct-fit applications across BMW M-series and Audi RS platforms. Their CNC mandrel bending produces 2.5D radius 45-degree bends with cross-sectional ovality consistently below 6%, compared to 10-12% we experienced with previous suppliers. Wall thickness variation through bend zones measures only 8-11% thinning versus the 15% maximum we specify. This precision eliminates our secondary inspection requirements and reduces our rejection rate to under 0.3%. Their investment in multi-axis bending equipment enables complex three-dimensional routing geometries that match OEM packaging constraints within ±1mm positional tolerance. We've tested their Type 304L low-carbon variant in thermal shock cycling from -20°C to 780°C over 500 cycles with zero cracking failures. Technical collaboration has been excellent - they've helped us optimize bend sequences to reduce piece count and welding operations. Looking forward to continued partnership as we expand our product line into turbocharged gasoline applications requiring 321 grade material.
用户
Carlos Mendoza
Brazil
2025-11-28
Good Value 409 Ferritic Pipes for Cost-Sensitive Applications
Good value proposition for our biomass boiler exhaust manifold project. We compared quotes from 6 suppliers across South America and Asia, and their pricing on Type 409 ferritic grade was 23% lower than austenitic alternatives while maintaining adequate performance for our 620°C continuous operating temperature. Ordered 320 meters with 3.2mm wall thickness for pressure vessel code compliance. Material quality met our expectations with 11.4% chromium content verified by our third-party lab testing. Surface finish had some minor mill scale in isolated areas that required light wire brushing before welding, adding about 15 minutes per joint in prep time. Dimensional consistency was good with OD measurements ranging 76.1-76.4mm across random sampling of 20 pieces. Straightness deviation measured 0.4mm per meter, acceptable for our application. Overall solid product for cost-conscious industrial heating applications where Type 304 would be over-specification. 4 stars because surface preparation required slightly more effort than premium grades, but the 28% cost savings justified the minor additional labor for our production volume.
用户
James Robertson
United Kingdom
2025-12-18
Outstanding Service and Fast Delivery for Automotive Production
Excellent service experience from initial technical consultation to final delivery. Communication was exceptional - their engineering team responded to our CAD file submission within 6 hours with detailed fabrication recommendations that reduced our material waste by 12%. They suggested optimizing our bend sequence to eliminate one welded joint per assembly, saving significant production time. Technical support provided complete thermal expansion calculations for our 2.8-meter routing sections, accounting for 450°C operating temperature. Delivery exceeded expectations - 180 meters of custom-cut 3-inch 304 exhaust pipe arrived in 11 days, beating the quoted 15-day lead time by 4 days. Packaging was professional with each 6-meter length individually wrapped in VCI paper, plastic capped ends, and secured in steel-banded bundles. All pieces arrived with zero transit damage. EN 10204 Type 3.1 certificates were included with complete traceability documentation. Their proactive communication included shipment photos and tracking updates every 48 hours. This level of service professionalism sets them apart from other suppliers we've worked with in the European market.
用户
Michael Chen
Singapore
2026-01-02
Excellent 3" 321 Grade Exhaust Pipes for Turbocharged Marine Engines
We ordered 250 meters of 3-inch Type 321 stainless steel exhaust pipe with Schedule 10S wall thickness for our high-performance marine diesel retrofit project. Material certificates confirmed titanium stabilization at 0.42% and chromium content at 18.2%, fully compliant with ASTM A312 standards. We conducted bend testing on mandrel-formed 90-degree sections - zero cracking observed even at 2D radius. Surface finish was consistent 2B grade with mill certification showing Ra 1.4 μm. The TIG welded seams passed our ultrasonic inspection per ASTM E213 with no discontinuities detected. Thermal cycling tests between 150°C and 850°C showed excellent resistance to scaling. Delivered in 18 days with proper wooden crate packaging and argon purging for long-term storage. This is our 4th order over 14 months for various vessel upgrades. Quality consistency has been outstanding across all shipments. Highly recommended for turbocharged applications requiring superior high-temperature performance.

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快马钢铁有限公司

入驻 Sinoali.com 7 年

所在地:China

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$1380 1-49 吨 基准价
$1320 50-99 吨 4.3% 优惠
$1290 ≥100 吨 6.5% 优惠
价格有效期:随行就市

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商品小计 US$ 1,380.00
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