What is DIN 2391 Standard specification?

 

DIN 2391 including two parts:

Part 1 is DIN 2391-1, Seamless precision steel tubes – Dimensions. download

Part 2 is DIN 2391-2, Seamless precision steel tubes – Technical delivery conditions: download

 

DIN 2391 is included in DIN Handbook 3 and 272. Gives dimensions for seamless precision steel tubes; these tube dimensions have been selected from the range of manufacturable tube dimensions which are mainly used as design elements. The tube dimensions follow ISO/DIS 3304.

 

DIN2391 References as such:

BS 7416 – Specification for Precision finished seamless cold-drawn low carbon steel tubes for use in hydraulic fluid power systems

BS 7388 – Guide for Prevention of leaks from hydraulic fluid power systems

 

The main products of steel / steel grade: DIN2391-1(ST35, ST45, ST52).

Steel name C max Si max Mn P max S max
St 35 0.17 0.35 ≥0.40 0.025 0.025
St 45 0.21 0.35 ≥0.40 0.025 0.025
St 52 0.22 0.55 ≤1.60 0.025 0.025

 

DIN2391 steel grade mechanical property

Steel Grade Steel number BK cold finished hard BKW (soft) BKS cold finished + stress GBK annealed NBK Normalized
Tensile MPA Elongation % A Tensile MPA Elongation % A Tensile MPA Yield MPA Elongation % A Tensile MPA Elongation % A Tensile MPA Yield MPA Elongation % A
st 30 Si 1.0211 430 8 380 12 380 280 16 280 30 290-420 215 30
st 30 AL 1.0212 430 8 380 12 380 280 16 280 30 290-420 215 30
st 35 1.0308 480 6 420 10 420 315 14 315 25 340-470 235 25
st 45 1.0408 580 5 520 8 520 375 12 390 21 440-570 255 21
st 52 1.0589 640 4 580 7 580 420 10 490 22 490-630 355 22

 

DIN2391 Application

Steel pipe for hydraulic system, steel pipe for automobile, widely used in hydraulic system steel pipe, steel pipe for injection molding machine, steel pipe for hydraulic machine, marine steel pipe, EVA foam oil pressure machinery, precision oil pressure cutting machine steel pipe, shoe machinery, hydraulic equipment, high pressure oil pipe, hydraulic oil pipe, tube joints, steel pipe joints, rubber machinery, forging machinery, die-casting machinery, engineering machinery, high pressure steel pipe for mixer pump truck, sanitation car, automotive industry, shipbuilding industry, metal processing, military industry, diesel engine, internal combustion engine, air compressor, construction machinery, agriculture and forestry machinery, etc.

 

Fushun Metal LTD CO

Fushun Metal is a large seamless steel tube manufacturer and supplier. We are metal experts and have been providing quality customer service and products since 1998.

 

At Fushun Metal, we supply a wide range of metals for a variety of applications. Our products/stock includes: cold rolled steel tube, cold drawn steel tube, hollow bar, plate tube, boiler tube, alloy steel tube, stainless steel tube, nickel alloy tube, flanges etc

 

Our steel tubes and pipes are available in a wide range of process including: cold drawn, cold rolled, hot rolled, polished, threaded, painted etc. We can cut metal to your exact specifications.

 

Send your inquiry information to us and get a free quotation today!