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  1、GB1222-84　  
Spring Steel
  2、GB1805-86　  
Terminology of Springs
  3、JB3782-84  
Metallographic Examination Standard for Steel Plate Spring of Automobiles
  4、JB3383-83  
Testing Method for Steel Plate Spring Bench of Automobiles
  5、QCn29035-91  
Technical Conditions for Steel Plate Spring of Automobiles
  6、QZL032-87  
Stipulation on Quality-graded Steel Plate Spring of Automobiles
  7、HBT06001  
Processing Rule for Spring Shot of Automotive Steel Plate
  8、GB230-84　  
Testing Method for Rockwell Hardness of Metal
     
 
     
 
 
 
 
Henna Changtong Auto Fittings Manufacturing Co., Ltd, Copyright Reserved；
Technology Support: Huawei Electronic Business
Address:Industry Demoustration Park,Yong'an Street ,Gongyi City,HeNan Province,China；Postal Code: 451252
Telephone for selling band spring: 86-371-64134128 69618768；Telephone for selling spring flat: 86-371-64136538
Supervision Telephone: 86-371-64136518；Fax: 86-371-64134128
http://www.cn-changtong.com E-mail:ct@cn-changtong.com