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Specification

Material	UNS S31603 (316L), the chemical compositions in accordance to Table DT-3 ASME BPE Chemical Composition in weights% C max. 0.035 Ni = 10.00 – 15.00 Cr = 16.00 – 18.00 P max. 0.045 Mn max. 2.00 Si max 1.0 Mo = 2.00 – 3.00 S = 0.005 – 0.017 further materials acc. to ASME BPE
Dimensions	1/4“ x 0.035 (6.35 x 0.89 mm) to 6” x 0.109 (152.40 x 2.77 mm)
Technical terms of delivery	Tubes and Fittings: According to ASME BPE, ASTM A 269 / A 270 Length: 5900 - 6090 mm (max. 10% short lengths possible)10088-3, DIN 17440 Tolerances: According to ASME BPE section MMOC Ends: Tubes and fittings are prepared for orbital welding
Surface options	inner surface: As per ASME BPE, section SF bright finished SF1: Ra max: 20 μin, 0.51 μm mechanically polished and electropolished SF4: Ra max: 15 μin, 0.38 μm Outer surface: Tubes and Fittings Ra ≤ 0.80 μm (32 μin)
Inner surface treatment	Tubes SF1: Cleaning and test procedure ASTM A 632, S3 Tubes SF4: Electropolishing procedure Spec. HE 175 4VN Fittings SF1: Cleaning and test procedure ASTM A 632, S3 Fittings SF4: Electropolishing procedure Spec. HE 111 4VN
Hardness	max. 180 HV /90 HRB
Test procedures	Verification of basic test certificate Verification of dimensions Visual control Roughness measurements Endoscopic inspection of bright finished tubes
Marking	Dockweiler ASME BPE Surface symbol as per ASME BPE, section SF3 Dockweiler no. (batch no.) Heat number Material Dimension
Documentation	Certified Test Report 3.1 as per DIN EN 10204 and ASTM A 1016 for the prematerial
Packaging and Delivery	Ends are closed with transparent PE caps (electropolished parts with PE/PA squares). Tubes and fittings are individually sleeved and sealed in PE, marked with a white sticker „ASME BPE SF1“, electropolished parts with yellow caps and marked with yellow sticker „Dockweiler BPE SF4”. Delivery of tubes in tubular container or wooden crate, of fittings in strong cardboard box or wooden crate with shock absorbing filler.

Dockweiler BPE Surfaces

Inner surfaces

The welded Dockweiler BPE tube in accordance with ASME BPE, inner surface finished to fulfil the Ra max ASME BPE specification, supplied in UNS S 31603 (316L) as specified in Table DT3 ASME BPE and in the surface qualities SF1 and SF4. Further surfaces on request.

SF1:

welded and mechanically polished Ra max ≤ 0.51 µm/20 µin

SF4:

welded and electropolished in accordance with specification HE 175 4VN (tubes) and HE 1114VN (fittings) Ra max ≤ 0.38 µm/15 µin

Abbildung Dockweiler BPE Mikroskopbilder

Electropolished Surface

Characteristics/Advantages:
Reduction of the surface area, the closed chromium oxide layer optimizes the corrosion resistance and welding characteristics, no catalytic reaction with the medium.