Seamless Steel Tubes for Low and Medium Pressure Boiler GB 3087

Seamless Steel Tubes for Low and Medium Pressure Boiler GB 3087

Spec:

Material:10# 20# STB33/42 st35.8

Size Range:OD:4-1200mm

                    WT:0.3-200mm

                    General Length:4-12.5m

Tolerance:

According to the following tables or customers’ request.

Tolerance of the OD &WT:

OD Tolerance:

Tolerance for wall thickness:

1.Wall thickness tolerance of Hot Rolling steel tube:

2.Wall thickness tolerance of Cold Drawn(Cold Rolled) steel tube:

Bending tolerance:

WT≤15mm, Bending≤1.5mm/m

WT＞15mm~30mm, Bending≤2.0mm/m

WT＞30mm/OD≥351mm, Bending≤3.0mm/m

Ovality and Wall unevenness:

The ovality and wall unevenness should be no more than 80% of the OD and wall thickness.(Or according to customer`s request)

Test:

1. Bending test
2. Hardness test
3. Impact test
4. Squeezing test
5. Non-destructive test

Characteristic:

Good concentricity

Good OD and ID tolerance

High Precision

Stable quality

Smooth Roughness

TORICH QUALITY ASSURANCE

Processing:

RAW MATERIAL

↓

INCOMING INSPECTION

↓

STORAGE → CUTTING→HAMMERING → PICKING LUBRICATION → CLEANING → PHOSPHORI CLEAN

↓

ENDS CUTTING←STRAIGHTENING←HEAT TREATMENT↔MIDDLLE CHECK↔ COLD DRAWING ← LUBRICATING

↓

FINAL INSPECTION→BUNDING→STORAGE

Technical Delivery Conditions:Hot rolling with NBK 

Widely used in the field of:Boiler pipe 

Product Images: