Newly Arrival St37.4 Stkm11A, 12b, 13A, 13b seamless Precision Automobile Steel Tube

Our products are widely recognized and trusted by users and can meet continuously changing economic and social needs of Newly Arrival St37.4 Stkm11A, 12b, 13A, 13b seamless Precision Automobile Steel Tube, The mission of our firm would be to deliver the very best high-quality products and solutions with most effective value. We’re hunting forward to doing company with you!
Our products are widely recognized and trusted by users and can meet continuously changing economic and social needs of China Welded Precision Steel Tube and Welded Steel Pipe, We severely promise that we give all the customers with the best quality products and solutions, the most competitive prices and the most prompt delivery. We hope to win a resplendent future for customers and ourselves.
Brief Introduction

ST37.4 ST44.4  ST52.4 Steel Grade Seamless Steel Tube for dynamic Loads Normal Pressures 100 to 400 bar is our company mainly product. It is widly used in heavy duty truck, military industry, railway locomotive,engine filed and the gas line in special vehicle.They could meet the requiremnts because of high precison of Out diameter and Inner diameter. Also its anti corrosion performance.

Technical Characteristics

    Standard:                     DIN 1630 DIN2445 

    Grade:                         ST37.4 ST44.4  ST52.4

    Heat Treament:            NBK(+N) normalized, BK, GBK,

    Surface Treament:       Army green passivated, Sliver Galvanized, Black Phosphated，Black paint，

    Straightness:               1mm/1000mm

    Dimension Telorance:  According to DIN1630 DIN2445 Standard

Feature

    High precison, smooth surface

    Strong anti rust/corrosion property

    No any corrosion after 220 hours’ Sale Spray Test

Delivery Conditions 

  The tubes can be produced in the following delivery conditions: 

  BK (+C) Cold finished/hard (cold finished as drawn).

  No heat treatment after the last cold forming process. 

  BKW (+LC) Cold finished/soft (lightly cold worked)

  After the last heat treatment there is a light finishing pass (cold drawing). 

  BKS (+SR) Cold finished/stress relieve annealed. 

  After the final cold forming process the tubes are stress relieve annealed. 

  GBK (+A) Annealed. 

  After the final cold forming process the tubes are annealed in a controlled atmosphere.

  NBK (+N) Normalized. (Mainly focus on)

  After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere

Application