Certificates

WYJ046-2005                           13MnNiMo5-4

1, applicable scope:

This standard stipulates MnNiMo5-4 13 (DIWA353, BHW35) boiler tube pan with the technical requirements of the steel plate.

2, steel manufacturing

Steel smelting by electric furnace, and should be the refining outside the furnace vacuum deairing with all of deoxidizing molded calm steel, the method of hot rolling steel manufacturing machine. Finished steel plate after normalizing + tempering heat treatment.

3, size deviation

3.1 steel plate size deviation should be allowed to meet the provisions of the EN10029, of which the steel plate straightness allow deviation according to GB709, thickness allow deviation for C level, according to the theory of steel weight delivery, theoretical weight nominal thickness according to + 50% on the added value of deviation calculation.

4, technical requirements

4.1 the chemical composition of steel besides melting analysis outside, still should be finished product analysis, and shall be in accordance with table 1.

Table 1

 

Steel grade	Chemical composition（％）
		C	Si	Mn	P	S	Ni	Mo	Cr	Nb	Al
13MnNiMo5-4	Melting analysis	0.08 0.15	0.10 0.50	1.00 1.60	≤0.020	≤0.010	0.60 1.00	0.20 0.40	0.20 0.40	0.004 0.020	≥0.015
	Product analysis	0.06 0.17	0.05 0.55	0.90 1.70	≤0.020	≤0.010	0.55 1.05	0.15 0.45	0.15 0.45	0.005 0.025	≥0.015

4.2 heat treatment

Steel should be after normalized + tempering heat treatment, and meet the requirements of the table 2.

 

Table 2

 

heat treatment	Heating temperature	hold time	type of cooling
normalized	890～950℃	thick≤50mm,≥15min thick＞50mm≥30min	air cooling
tempering	620～690℃	least 30min，and ≤18min①

 

(1) note: the time of heat temper according to actual production condition adjustment.

Certificate of quality shall be reported to the finished product steel plate of heat treatment of actual standard.

4.3 mechanical properties

The normalized and tempering heat treatment is finished product steel plate, the horizontal mechanics performance should be consistent with section 4.3.1 and the provisions of the 4.3.3 and 4.3.2.

 4.3.1 tensile properties of normal temperature

Table 3

 

Thick （mm）	yield strength Re(MPa)	tensile strength Rm(MPa)	elongation A（％）
≤50	≥400	570～740	≥18
50～100	≥390
100～125	≥380
125～250	≥375

 

4.3.2 The high temperature of steel plate instantaneous yield strength

The high temperature of steel plate instantaneous yield strength Rp0.2 should comply with the provisions of the table 4. Except where otherwise provided by the contract order, the temperature: 92 mm thickness for 350 ℃, the thickness of the 135 mm and 110 mm to 370 ℃.

Table 4

 

Thick mm	Rp0.2  Min  (Mpa)
	100℃	200℃	250℃	300℃	350℃	370℃	400℃
≤50	393	378	373	363	353		309
50～100	373	358	353	343	333		304
100～125	363	348	343	333	324	314	299
125～150	353	338	333	324	314	306	294

4.3.3 impact toughness and bending test

Table 5

 

Akv   J(note1)	bending test（注2）
0℃	d=3a  180°
≥31	Not Cracked

 

Note 1: the impact absorbing energy as the average of the three specimens in the table , allow one sample below rating, but may not be less than 85% of the rating.

Note 2: to the table of d for bending core, a is the sample thickness, carries out the standard GB/T232-99.