NEWS
We equipped with the most recent technologh manufacturing equipment and more than 150 skilled workmanship.
Your present position:
Homepage
-
-
-
How does the fastener industry choose raw materials?

How does the fastener industry choose raw materials?

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2021-09-06
  • Views:0

(Summary description)SelectionprincipleTheselectionofstainlesssteelmaterialsismainlyconsideredfromthefollowingfiveaspects.1.Requirementsforthemechanicalpropertiesoffastenermaterials,especiallystrength;2.Therequirementsofworkingconditionsonthecorrosionresistanceofmaterials;3.Therequirementsoftheworkingtemperatureontheheatresistanceofthematerial(hightemperaturestrength,oxidationresistance);4.Requirementsformaterialprocessingperformanceintermsofproductiontechnology;5.Otheraspects,suchasweight,price,andpurchasefactors,mustbeconsidered.Aftercomprehensiveandcomprehensiveconsiderationofthesefiveaspects,thegrades,varieties,specificationsandmaterialstandardsofthefastenersarefinallydeterminedAusteniticstainlesssteelThecommonlyusedgradesare302,303,304,and305,whicharetheso-called"18-8"austeniticstainlesssteels.Boththecorrosionresistanceandthemechanicalpropertiesaresimilar.Thestartingpointforselectionistheproductionprocessmethodofthefastener,andthemethoddependsonthesizeandshapeofthefastener,aswellasthequantityofproduction.302typeisusedformachinedscrewsandself-tappingbolts.303typeInordertoimprovethecuttingperformance,asmallamountofsulfurisaddedtothe303typestainlesssteel,whichisusedtoprocessnutswithbarmaterials.304typeissuitableforprocessingfastenersbyhotforgingprocess,suchaslongersizeboltsandlargediameterbolts,whichmaybebeyondthescopeofcoldforgingprocess.305typeissuitableforprocessingfastenersbycoldheadingprocess,suchascoldformingnutsandhexagonalbolts.309typeand310type,theirCrcontentandNicontentarehigherthan18-8typestainlesssteel,suitableforfastenersworkingathightemperature.316and317type,theybothcontainalloyingelementMo,sotheirhightemperaturestrengthandcorrosionresistancearehigherthan18-8typestainlesssteel.321typeand347type,321typecontainsrelativelystablealloyingelementTi,347typecontainsNb,thusimprovingthematerial'sresistancetointergranularcorrosion.Itissuitableforfastenersthatarenotannealedafterweldingorareinserviceat420~1013℃.

How does the fastener industry choose raw materials?

(Summary description)SelectionprincipleTheselectionofstainlesssteelmaterialsismainlyconsideredfromthefollowingfiveaspects.1.Requirementsforthemechanicalpropertiesoffastenermaterials,especiallystrength;2.Therequirementsofworkingconditionsonthecorrosionresistanceofmaterials;3.Therequirementsoftheworkingtemperatureontheheatresistanceofthematerial(hightemperaturestrength,oxidationresistance);4.Requirementsformaterialprocessingperformanceintermsofproductiontechnology;5.Otheraspects,suchasweight,price,andpurchasefactors,mustbeconsidered.Aftercomprehensiveandcomprehensiveconsiderationofthesefiveaspects,thegrades,varieties,specificationsandmaterialstandardsofthefastenersarefinallydeterminedAusteniticstainlesssteelThecommonlyusedgradesare302,303,304,and305,whicharetheso-called"18-8"austeniticstainlesssteels.Boththecorrosionresistanceandthemechanicalpropertiesaresimilar.Thestartingpointforselectionistheproductionprocessmethodofthefastener,andthemethoddependsonthesizeandshapeofthefastener,aswellasthequantityofproduction.302typeisusedformachinedscrewsandself-tappingbolts.303typeInordertoimprovethecuttingperformance,asmallamountofsulfurisaddedtothe303typestainlesssteel,whichisusedtoprocessnutswithbarmaterials.304typeissuitableforprocessingfastenersbyhotforgingprocess,suchaslongersizeboltsandlargediameterbolts,whichmaybebeyondthescopeofcoldforgingprocess.305typeissuitableforprocessingfastenersbycoldheadingprocess,suchascoldformingnutsandhexagonalbolts.309typeand310type,theirCrcontentandNicontentarehigherthan18-8typestainlesssteel,suitableforfastenersworkingathightemperature.316and317type,theybothcontainalloyingelementMo,sotheirhightemperaturestrengthandcorrosionresistancearehigherthan18-8typestainlesssteel.321typeand347type,321typecontainsrelativelystablealloyingelementTi,347typecontainsNb,thusimprovingthematerial'sresistancetointergranularcorrosion.Itissuitableforfastenersthatarenotannealedafterweldingorareinserviceat420~1013℃.

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2021-09-06
  • Views:0
Information

Selection principle

The selection of stainless steel materials is mainly considered from the following five aspects.

1. Requirements for the mechanical properties of fastener materials, especially strength;

2. The requirements of working conditions on the corrosion resistance of materials;

3. The requirements of the working temperature on the heat resistance of the material (high temperature strength, oxidation resistance);

4. Requirements for material processing performance in terms of production technology;

5. Other aspects, such as weight, price, and purchase factors, must be considered.

After comprehensive and comprehensive consideration of these five aspects, the grades, varieties, specifications and material standards of the fasteners are finally determined

Austenitic stainless steel

The commonly used grades are 302, 303, 304, and 305, which are the so-called "18-8" austenitic stainless steels. Both the corrosion resistance and the mechanical properties are similar. The starting point for selection is the production process method of the fastener, and the method depends on the size and shape of the fastener, as well as the quantity of production.

302 type is used for machined screws and self-tapping bolts.

303 type In order to improve the cutting performance, a small amount of sulfur is added to the 303 type stainless steel, which is used to process nuts with bar materials.

304 type is suitable for processing fasteners by hot forging process, such as longer size bolts and large diameter bolts, which may be beyond the scope of cold forging process.

305 type is suitable for processing fasteners by cold heading process, such as cold forming nuts and hexagonal bolts.

309 type and 310 type, their Cr content and Ni content are higher than 18-8 type stainless steel, suitable for fasteners working at high temperature.

316 and 317 type, they both contain alloying element Mo, so their high temperature strength and corrosion resistance are higher than 18-8 type stainless steel.

321 type and 347 type, 321 type contains relatively stable alloying element Ti, 347 type contains Nb, thus improving the material's resistance to intergranular corrosion. It is suitable for fasteners that are not annealed after welding or are in service at 420~1013℃.

Scan the QR code to read on your phone

News

Previous page
1
2
3

SHANGHAI SHANGDIAN Washer Co., Ltd.

 

Tel:

86-21-57317386  86-21-57317385
Factory Address: No.51 XinLi Rd,Zhujin Town XinNong,Jinshan District,Shanghai (201503),China
E-mail:
sunjin@shwasher.com

 

SHANGHAI SHANGDIAN Washer Co., Ltd. Copyright  2021 All Rights Reserved.  沪ICP备12035485号-2  Web:www.300.cn

上海上垫垫圈有限公司