Certificates

WYJ039-2006                         12MnNiVR

1. applicable scope

This technical conditions for tianjin ethylene refining crude oil storage and transportation in the integrated project supporting system (and crude oil in north China ShuZhuan system optimization engineering) new construction projects of four seats 100000 m3 floating roof tank (G- 04) with homebred 12 MnNiVR (including 12 MnNiVR-SR) steel plate order.

2. The reference standard

GB19189-2003  Pressure vessel with a high strength steel plate

GB6654-1996   steel heavy plate for pressure vessels

GB/T247-1997  Steel plate and steel with acceptance, packaging, sign and quality certificate the general rules

GB/T222-1984  The chemical composition of steel with sample sampling method and finished product chemical composition allow deviation

GB/T2975-1998 Steel and steel products mechanical test sampling location and samples preparation

GB/T3274-1988 Carbon structural steel and low alloy steel , hot rollingthicksteel plate and steel belt JB/T4730.1-2005～JB4730.6-2005  Nondestructive Testing of Pressure equipments

 

JB4708-2000   Pressure vessel welding procedure qualification

3. The size, shape, weight and allow deviation

Steel plate size, shape, weight and allow deviation according to GB/T709 and GB6654 rules. Among them along the direction of the steel plate width roughness: more than 20 mm thickness is no more than 6/1000 of the steel plate, less than 20 mm thickness of steel not more than 8/1000. And the thickness of the steel plate negative deviation is 0, thickness tolerance zone moves up whole 0.25 mm. Steel plate theory quality calculation method in the GB6654 standard based on the thickness of 0.125 mm added value increase.

4. Technical requirements

4.1 chemical composition

The chemical composition of the steel plate (melting analysis) should be in accordance with table 1, finished product analysis and melting analysis of error should be consistent with the GB/T222 rules.

 

Chemical composition ％		12MnNiVR（include 12MnNiVR-SR）
Rm(N/mm2)		610-730
Rel(N/mm2)		≥490
A,%		≥17
yield ratio    note 1		≤0.91
cold bend inspection		B=2a   180°   d=3a
Charpy impact test   Note 2	Three average（J）	≥100
	Single minimum（J）	≥70
	Test temperature（℃）	-15
	Sample shape	2mmVtype

 

Note 1: apply tothickness of 32 mm 27 mm and 20 mm steel, the real value, which is 20 mm thickness of steel allows 10% ofyield ratiomore than 0.91, but should not be more than 0.92

Note 2:32 mm steel plate thickness of the impact of the axis of the sample should be located in the thickness of the steel plate handled 1/2 place, then charpy impact energy three quartile average 60 J (_15 ℃) single minimum = 42 J (_15 ℃)