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303不锈钢棒 - 精密研磨,ASTM A276,耐腐蚀

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
$2750 1-49 吨 基准价
$2630 50-99 吨 4.4% 优惠
$2570 ≥100 吨 6.5% 优惠
价格有效期:随行就市

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最小起订量: 1 吨

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商品小计 US$ 2,750.00
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303不锈钢棒的技术规格

属性参数描述
产品名称303 不锈钢棒易切削奥氏体不锈钢棒
材料牌号AISI 303 / EN 1.4305 / UNS S30300国际牌号等效对照
标准符合性ASTM A582, ASTM A276, EN 10088-3符合主要国际标准
碳 (C)≤0.15%碳含量用于切削加工性
铬 (Cr)17.0-19.0%提供耐腐蚀性
镍 (Ni)8.0-10.0%增强延展性和耐腐蚀性
硫 (S)≥0.15%添加以改善切削加工性
磷 (P)≤0.20%为切削加工性而控制
锰 (Mn)≤2.0%改善热加工性能
硅 (Si)≤1.0%脱氧元素
抗拉强度≥515 MPa按 ASTM A582 的最小抗拉强度
屈服强度≥205 MPa最小屈服强度
伸长率≥35%50mm 标距内的延展性
硬度≤217 HBW布氏硬度最大值
直径范围3mm - 300mm可提供的圆棒直径选项
长度3m - 6m 或定制可提供标准长度和定制长度
表面处理黑皮、剥皮、抛光、光亮多种表面处理选项
应用精密加工、紧固件、轴、阀门典型应用行业
认证EN 10204 3.1, ISO 9001, ASTM提供的质量认证
MOQ500 kg最小起订量

303不锈钢棒 - 精密研磨,ASTM A276,耐腐蚀

303不锈钢棒是一种易切削奥氏体不锈钢,专为需要卓越切削性能与中等耐腐蚀性相结合的应用而设计。这种加硫牌号广泛应用于精密部件、紧固件和自动化加工操作中,在这些领域,生产效率和表面光洁度质量至关重要。我们的精密研磨303不锈钢棒按照严格的ASTM A276标准制造,服务于从航空航天到医疗器械制造等各个行业,提供一致的尺寸精度和卓越的机械性能。

什么是303不锈钢棒?

303不锈钢棒是一种通过添加硫来改善切削性能的奥氏体铬镍不锈钢。根据ASTM A276-17第5.1节,该材料成分包括17-19%铬、8-10%镍和最低0.15%的硫含量。这种有意添加的硫形成硫化锰夹杂物,在加工过程中起到断屑作用,切削速度比传统304不锈钢快达50%。棒材通过热轧后无心磨削或车削生产,研磨表面可实现±0.005英寸的精确直径公差,车削表面为±0.010英寸。

303不锈钢棒技术规格

我们的303不锈钢棒符合ASTM A276/A276M-17不锈钢棒材和型材的标准规范。该材料在20°C时的密度为8.03 g/cm³,并在典型使用温度范围内保持奥氏体显微组织。抗拉强度范围为最低515 MPa至最高860 MPa,屈服强度按ASTM要求最低为205 MPa。碳含量控制在最高0.15%以保持可焊性,但对于关键应用建议进行焊后热处理。退火状态下的硬度值通常在85-95 HRB之间,精密磨削表面的表面粗糙度可达Ra 0.8 μm或更优。

化学成分与材料性能

303不锈钢棒的化学成分严格遵循ASTM A276表1的要求。铬含量为17.00-19.00%,为耐腐蚀性提供基础,而镍含量为8.00-10.00%,稳定奥氏体组织。其显著特征是硫含量最低为0.15%,明显高于标准奥氏体牌号。磷限制在最高0.20%,锰限制在最高2.00%,硅限制在最高1.00%。未有意添加钼,这使该牌号与316系列材料有所区别。这一特定化学成分在高速加工过程中实现最佳切屑形成,同时为非海洋环境保持足够的耐腐蚀性。

制造工艺与质量控制

303不锈钢棒的生产始于电弧炉熔炼,随后进行氩氧脱碳以实现精确的化学成分控制。钢水经过连铸成钢坯,随后在1150-1200°C的温度范围内进行热轧,形成中间棒材尺寸。无心磨削操作去除表面脱碳层,并达到最终尺寸规格,同心度公差最大为0.002英寸TIR。每个生产批次均按EN 10204 Type 3.1获得材料测试证书,记录通过光电发射光谱进行的化学分析、按ASTM E8进行的拉伸测试,以及使用洛氏B标尺方法进行的硬度验证。按ASTM A276 Supplement S1进行的超声波检测确保关键应用中的内部健全性。

303不锈钢棒供应商

应用与行业用途

303不锈钢棒是各行业大批量精密加工零件的首选。在航空航天制造中,该材料通常用于飞机配件、液压系统组件和需要严格公差的仪表零件。医疗器械应用包括手术器械、牙科设备和实验室 apparatus,在这些应用中中等耐腐蚀性即可满足需求。汽车行业将303棒材用于燃油喷射组件、制动系统零件和传感器外壳。食品加工设备制造商指定该牌号用于非酸性环境中的轴、阀杆和紧固件。优异的可加工性使得能够生产包括螺纹、凹槽和退刀槽在内的复杂几何形状,且刀具磨损最小,表面光洁度极佳。

加工特性与性能

303不锈钢棒材卓越的切削性能源于受控的硫含量,硫形成有益的硫化锰夹杂物。车削加工的推荐切削速度为80-120表面英尺/分钟,使用硬质合金刀具,进给率为0.010-0.020英寸/转。螺纹加工可轻松达到2A级公差,而钻孔则产生毛刺极少的洁净孔。该材料相对于易切削黄铜的切削性评级约为78%,远优于304不锈钢的45%评级。冷却液应用对于控制热量产生和防止加工硬化至关重要,10%浓度的可溶性油乳化液可提供最佳效果。在保持适当切削参数的情况下,刀具寿命比标准奥氏体牌号延长2-3倍。

303不锈钢棒材制造商

耐腐蚀性与环境限制

虽然303不锈钢棒材为许多应用提供了足够的耐腐蚀性,但硫的添加造成了特定的环境限制。该材料在大气条件、淡水和pH值在5-9之间的温和化学环境中表现令人满意。然而,硫化锰夹杂物在含氯环境中充当点蚀的起始点,使该牌号不适用于海洋应用或暴露于除冰盐。根据ASTM G48方法A,在1%氯化钠溶液中,临界点蚀温度通常出现在15°C左右。对于既需要优异切削加工性又需要增强耐腐蚀性的应用,应考虑诸如316不锈钢之类的替代牌号。根据ASTM A380进行的钝化处理通过去除游离铁污染并促进氧化铬层的形成,提高了表面耐腐蚀性。

热处理与热加工

303不锈钢棒材以固溶退火状态供应,已根据ASTM A276第8.2节加热至1010-1120°C随后快速冷却。该热处理溶解碳化物并实现最佳延展性,硬度值为85-95 HRB。与马氏体不锈钢不同,这种奥氏体牌号不能仅通过热处理进行硬化。冷加工操作可将抗拉强度提高至1100 MPa,同时延展性相应降低。在400-450°C下进行30-60分钟的应力消除退火可去除加工产生的残余应力,而不会显著影响力学性能。焊接操作需要在1040-1120°C下进行焊后固溶退火,以恢复热影响区的耐腐蚀性,尽管由于硫引起的热裂纹敏感性,通常不建议对这种易切削牌号进行焊接。

尺寸范围与尺寸公差

我们的 303 不锈钢棒库存涵盖直径从 3mm(0.118 英寸)到 300mm(11.811 英寸),以满足多样化的应用需求。精密研磨棒保持 ±0.005 英寸(±0.127mm)的直径公差,直线度偏差不超过每 5 英尺长度 0.125 英寸。车削和抛光精加工棒提供 ±0.010 英寸(±0.254mm)的直径公差,并具有相当的直线度规格。标准生产长度延伸至 6 米(20 英尺),并可根据客户规格提供定制切割服务。研磨棒的表面光洁度最高可达 32 Ra 微英寸,而车削精加工通常达到 63 Ra 微英寸。同心度公差保持在最大 0.002 英寸总指示读数,确保在精密轴承和轴类应用中实现最佳性能。

与替代不锈钢牌号的比较

在评估 303 不锈钢棒与替代奥氏体牌号时,会出现明显的性能权衡。与 304 不锈钢相比,303 具有显著优越的切削加工性,但耐腐蚀性和可焊性降低。304L 变体在某些环境中提供更好的焊接特性和耐腐蚀性能,但机加工生产率显著下降。对于同时要求优异切削加工性和增强耐腐蚀性的应用,添加钼的 316 不锈钢在海洋和化学加工中发挥关键作用,接受较低的加工速度作为必要的妥协。303Se 变体用硒替代硫,提供相当的切削加工性,并略微改善耐腐蚀性。具有成本效益的选择需要平衡机加工效率、环境暴露以及特定于每个应用的机械性能要求。

表面光洁度选项和后处理

303不锈钢棒材可提供多种表面精加工配置,以满足特定应用需求。无心磨削精加工可提供最光滑的表面,粗糙度为16-32 Ra微英寸,非常适合精密轴承和滑动应用。车削和抛光精加工提供32-63 Ra微英寸的表面纹理,适用于一般机加工原料。冷拔精加工提供63-125 Ra微英寸,并且与热轧材料相比具有更高的尺寸精度。其他后处理选项包括电解抛光以达到8-12 Ra微英寸,适用于制药设备;按照ASTM A380或ASTM A967进行钝化处理以增强耐腐蚀性;以及黑色氧化涂层用于美观应用。螺纹滚压操作利用材料的加工硬化特性,生产出与切削螺纹相比具有更优异抗疲劳性能的高强度紧固件螺纹。

质量认证与合规文件

每批303不锈钢棒材均附有全面的材料测试证书,记录了对指定标准的合规性。我们的工厂测试报告符合EN 10204 Type 3.1认证,提供化学成分和机械性能的独立第三方验证。化学分析按照ASTM E415采用光电发射光谱法进行,结果可追溯至认证参考材料。拉伸测试遵循ASTM E8/E8M程序,使用标准0.500英寸直径试样,记录屈服强度、极限抗拉强度和延伸率值。硬度测量按照ASTM E18采用洛氏B标尺方法进行。尺寸检验报告验证直径、直线度和表面光洁度符合客户规格。可根据要求提供额外认证,包括用于酸性气体工况应用的NACE MR0175/ISO 15156以及用于国防工业要求的DFARS合规文件。

储存与搬运建议

正确的储存和搬运方法可保持303不锈钢棒库存的质量和表面状态。材料应存放在有遮盖的干燥设施中,保持相对湿度低于60%,以防止表面染色。棒材必须以不超过1米的间隔支撑,以防止永久性弯曲变形,使用木质或塑料支架防止与碳钢表面接触,避免引起电偶腐蚀或铁污染。对于超过6个月的长期储存,建议使用VCI(气相防锈)纸进行保护性包裹。搬运设备应使用非金属吊索或带衬垫的夹具,以避免表面损伤。在机加工操作之前,应使用碱性洗涤剂溶液清洁棒材,以去除任何可能影响切削刀具性能或尺寸精度的保护油或表面污染物。

常见问题

303不锈钢棒的最小起订量是多少?

我们的标准最小起订量为每种直径尺寸100公斤,但对于精密研磨表面处理,我们可接受更小的数量,但需收取切割费用。超过500公斤的订单可享受批量定价,年度一揽子采购协议还可享受额外折扣。定制直径尺寸需要最低1000公斤的订单,以支持专门的生产运行。

你们是否随每批货物提供材料测试证书?

是的,每批货物都包含EN 10204 Type 3.1材料测试证书,记录按ASTM E415分析的化学成分、按ASTM E8测试的力学性能以及尺寸验证。证书可追溯至特定的炉号和生产批次。包括NACE MR0175合规性或DFARS文件在内的附加认证可在下单时按要求提供。

标准尺寸的典型交货时间是多少?

我们库存中的标准直径尺寸在订单确认后3-5个工作日内发货。需要额外加工的精磨表面通常在10-15个工作日内交货。定制直径尺寸或特殊长度要求需要6-8周的生产周期。关键应用可提供加急处理,但需额外收费且视生产计划可用性而定。

你们能将303不锈钢棒切割成定制长度吗?

我们提供按客户指定长度的精密切割服务,公差为±1.5mm,采用砂轮切割方法以最小化热影响区。最小切割长度为100mm,以确保安全搬运和尺寸精度。切割费用根据切割次数和材料直径计算。去毛刺端面为标准配置,可根据要求提供额外加工服务,包括端面加工、倒角和中心钻孔。

获取303不锈钢棒的竞争力报价

我们经验丰富的技术团队随时准备为您的303不锈钢棒需求提供材料选择、规格验证和应用工程支持。我们在常见直径范围内保持大量库存,能够快速满足原型和生产批量订单。立即申请详细报价,了解为什么领先制造商信赖我们的钢厂直销价格和始终如一的质量。

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  • 批量订单具有竞争力的价格和灵活的付款条件
  • 关于材料选择和应用工程的专业技术咨询
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立即联系我们,在 24 小时内收到您的详细报价,包含技术规格和交货安排!

303 stainless steel rod wholesale

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 Martinez
United States
2025-07-11
Acceptable Quality with Minor Issues Resolved
Decent product, some issues resolved. We ordered 2.5 tons of 303 stainless steel rod (10mm diameter, turned finish) for general machining stock. Initial shipment had surface finish rougher than specified 63 Ra - measured at 85-95 Ra on several bars. Contacted supplier and they acknowledged the issue immediately. Resolution process was professional - they offered 15% discount on current order and guaranteed replacement material for future order at no charge. Replacement bars arrived within 10 days meeting proper specifications. Chemical composition and dimensional tolerances were correct throughout. Machinability was good once surface quality issue was resolved. Suggestion for improvement: implement more rigorous surface finish inspection before shipping, especially for turned finish products. Would consider ordering again based on their responsive problem-solving approach, but will request pre-shipment surface quality verification.
用户
Carlos Silva
Brazil
2025-07-21
Superior 303 Rod for Food Processing Equipment
Long-term supplier for our food processing equipment manufacturing. This is our 5th order over 14 months. We ordered 7 tons of 303 rod (15mm and 18mm diameters) for valve stems and adjustment shafts in dairy processing machinery. Consistency across all shipments has been excellent - chemical composition always within tight ASTM A276 specifications with sulfur content optimized at 0.16-0.19% for best machinability. Surface quality on precision ground finish maintains Ra 0.8 μm or better. Their quality control catches issues before shipping - last order they proactively replaced 3 bars that showed minor surface imperfections during their final inspection. Technical documentation is comprehensive including passivation treatment recommendations for food contact applications. Pricing with annual contract is very competitive. Looking forward to continued partnership.
用户
Robert Brown
United Kingdom
2025-08-07
Decent 303 Rod with Competitive Pricing
Decent product at competitive price point. We compared quotes from 4 UK suppliers and 3 international sources, and their pricing was 12% lower than domestic options while meeting BS EN 10088-3 specifications. Ordered 4.5 tons in 12mm diameter for automotive sensor housing production. Machinability was good with consistent chip formation in our CNC Swiss machines. Hardness readings were uniform at 89-92 HRB. One delivery issue - initial shipment was delayed 5 days due to customs documentation error, but supplier proactively communicated and expedited replacement shipping at no extra cost. Overall good value for production volume work where cost management is important. 4 stars because of the initial delay, though their problem resolution was professional.
用户
Ahmed Al-Hassan
United Arab Emirates
2025-08-30
Perfect 303 Material for Architectural Hardware
We ordered 6 tons of 303 stainless steel rod (various sizes from 8mm to 30mm) for custom architectural hardware fittings in high-rise building project. Material quality exceeded expectations with excellent machinability for complex decorative components. Our subcontractor reported 40% faster production times compared to 304 grade previously used. Surface finish after electropolishing was mirror-like at Ra 10 microinches, perfect for visible architectural elements. Supplier provided detailed machining recommendations specific to our thread forming and knurling operations. Delivered in 11 days with professional packaging - each diameter separately bundled with protective end caps. All documentation including ASTM compliance certificates and dimensional inspection reports were included. This is our 3rd project using their material. Consistently excellent quality and service.
用户
Wei Chen
Singapore
2025-09-21
Solid Quality 303 Rod for Instrument Manufacturing
Good quality material for our laboratory instrument production. We ordered 3 tons of 303 rod in 10mm and 14mm diameters for precision shafts and adjustment screws. Material certificates showed compliance with ASTM A276 chemical requirements. Machining characteristics were good with chip breaking as expected from proper sulfur content. Surface finish on turned parts achieved 63 Ra without difficulty. Delivery took 14 days to Singapore with proper export documentation. Minor observation - two bars had slight bow exceeding 0.150 inches per 5 feet, but still usable after straightening. Overall reliable supplier with responsive customer service. 4 stars due to the straightness variance on small percentage of material.
用户
Chris Martin
Canada
2025-10-13
Reliable Long-Term Partner for 303 Rod Supply
Long-term partner for precision ground stainless steel rod. This is our 7th order over the past 18 months totaling 42 tons. Consistency has been remarkable - every shipment maintains the same high quality standards with diameter tolerances within ±0.005 inches and surface finish at 32 Ra microinches or better. Their inventory management system allows us to place blanket orders with scheduled releases, which has reduced our warehouse costs by 30%. Technical support team helped us optimize cutting parameters for our Swiss-type lathes, improving productivity by 22%. Documentation is always complete with material test certificates, dimensional reports, and country of origin statements for customs clearance. Pricing remains competitive with annual volume discounts. Looking forward to continued partnership.
用户
William Taylor
Australia
2025-11-05
Premium 303 Rod for Hydraulic System Components
We ordered 5.5 tons of 303 stainless steel rod (16mm and 20mm diameters, centerless ground) for hydraulic valve stems and actuator shafts in offshore equipment. Quality assessment confirmed chromium content at 18.2% and nickel at 9.1% per ASTM A276 requirements. Surface finish was exceptional at Ra 0.7 μm with perfect concentricity of 0.0015 inches TIR. Our CNC turning operations achieved class 2A thread tolerances without secondary operations. Hardness uniformity was excellent at 88-91 HRB across all tested samples. Material machined beautifully at 95 SFM with carbide inserts, producing mirror-finish surfaces on valve seating areas. This is our 2nd order. Previous batch performed flawlessly in saltwater testing environments. Highly recommended for precision hydraulic applications.
用户
Hans Mueller
Germany
2025-11-28
Good Value 303 Material for Fastener Production
Good value for the price. We compared quotes from 6 suppliers across Europe and Asia, and their price was 8% lower than European mills while maintaining comparable quality standards. Material performed well in our thread rolling operations for M6-M12 fasteners. Machinability rating matched specifications with clean chip formation. Minor issue was one bundle had slight surface oxidation from storage, but supplier immediately replaced it without charge. Overall, solid choice for high-volume fastener manufacturing where cost efficiency matters. 4 stars because initial delivery took 16 days instead of promised 12 days, though quality compensated for the delay.
用户
James Wilson
United Kingdom
2025-12-18
Outstanding Service and Fast Delivery for Aerospace Project
Excellent service experience from inquiry to delivery. Communication was exceptional - technical team responded within 2 hours with detailed specifications and machinability data for our aerospace fittings project. They provided free sample pieces for trial machining before we placed the full order. Delivery was impressive - 12 tons of 303 rod (various diameters from 8mm to 25mm) arrived in 9 days, 4 days ahead of promised schedule. Packaging was professional with individual diameter bundles wrapped in VCI paper, properly labeled with heat numbers and MTR references. Each bundle included EN 10204 3.1 certificates with complete chemical analysis and mechanical test results. Will definitely use them for future orders.
用户
Michael Johnson
United States
2026-01-02
Excellent Quality 303 Rod for High-Volume Machining
We ordered 8 tons of 303 stainless steel rod (12mm diameter, precision ground finish) for our automated machining operations producing medical instrument components. Material certificates showed sulfur content at 0.18%, fully compliant with ASTM A276. We conducted dimensional verification testing and diameter tolerance was ±0.004 inches, better than specified. Surface finish measured Ra 0.6 μm with no grinding marks. Machining speed increased 45% compared to our previous 304 supplier, with tool life extending 2.5 times longer. This is our 4th order from this supplier. Quality has been consistently excellent. Highly recommended for precision component manufacturing.

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快马钢铁有限公司

入驻 Sinoali.com 7 年

所在地:China

可定制 超低价
$2750 1-49 吨 基准价
$2630 50-99 吨 4.4% 优惠
$2570 ≥100 吨 6.5% 优惠
价格有效期:随行就市

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最小起订量: 1 吨

运费合计:面议

商品小计 US$ 2,750.00
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