There are several types of pipe tempering

Secundum GB/T9711.1 pipelinea ferri fistulae peractionis requisita, secundum varias temperies temperaturae, in has species temperaturae dividi possunt:

[1] Temperatio humilis temperatura (CL-CCL gradus);
Microstructura per frigiditas temperatura temperatura martensita temperatur.Propositum est reducere exstinguibilem vim et duritiem ferri obdurati in praemissis sustinendi sui altitudinis duritiem et induendi resistentiam, ad vitandum fracturam vel praematuram damnum in usu.Maxime adhibita est pro omnibus generibus instrumentorum secantium carbonis altae, instrumenta metientis, GB/T9711.1 fistula ferrea pipeline, gestus volvens et partes carburizing, etc.

[2] Temperans temperans moderatus (250-500 gradus);
Microstructura moderata temperatione trostite temperatur.Propositum est obtinere altam, cedere viribus, elasticam limitem et altam duritiem.Ideo maxime adhibita est ad omnes species GB/T9711.1 pipelinea ferrea fistula et forma calida curationis, post duritiam temperaturae plerumque HRC35-50.

[3] Temperatio alta temperans (500-650 gradus);
Microstructura ab caliditate temperata temperatione sortensita temperatur.Solent autem calor coniunctus restinguendo et temperando sedare et temperare dicitur.Propositum est ut proprietates mechanicas meliores comprehendant fortitudinis, duritiae, plastici et duritiae.Ideo late in autocinetis GB/T9711.1 fistulae ferreae, instrumentorum machinarum et aliarum partium structurarum magni momenti, ut conectuntur virga, telum, arma et telum.Duritia post temperationem plerumque HB200-330.

Standard

API SPEC 5L -- American Petroleum Institute Standard

GB/T9711 -- National vexillum Sinarum

usus

Usus oxygeni, aqua et oleum fistulam in petrolei et gasi naturales portantes

Praecipua productio fistulae ferri gradus:

B, X42, X52, X60, X65, X70 L245 L290 L320 L360 L390 L450 L485

Mechanica proprietatibus

Standard	Productum Level	Steel Gradus	Vi cede (min), Mpa	Distrahens Strength（MPa）
API 5L GB/T9711.2	PSL 1	A vel L210	210	335
		B vel L245	245	415
		x42 vel L290	290	415
		X46 vel L320	320	435
		X52 vel L360	360	460
		X56 aut L390	390	490
		X60 aut L415	415	520
		X70	483	565
	PSL 2	BR vel L245R	245~450	415~760
		X42R vel L290R	290~ 495	415~760
		BN vel L245N	245~450	415~760
		X42N vel L290N	290~ 495	415~760
		X46N vel L320N	320~525	435~760
		X52N vel L360N	360~ 530	460~760
		X56N vel L390N	390~ 545	490~ 760
		X60N vel L415N	415~565	520~ 760
		X65N vel L450N	425~566	525~ 760
		X70 vel L480	484~565	565~768
		X80	552~690	621~827

Tabula elementorum chemicorum in pipeline

Productum Level	Steel Gradus	Chemical Compositio, %
Productum Level	Steel Gradus	C	Mn	P	S	Et	IN	Nb	Of	CEpcm
PSL 1	B vel L245	≤0.28	≤1.20	≤0.030	≤0.030	-	-	-	-	-
	x42 vel L290	≤0.28	≤1.30	≤0.030	≤0.030	-	-	-	-	-
	X46 vel L320	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
	X52 vel L360	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
	X56 aut L390	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
	X60 aut L415	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
	X70	≤0.28	≤1.40	≤0.030	≤0.030	-	-	-	-	-
PSL 2	BR vel L245R	≤0.24	≤1.20	≤0.025	≤0.015	≤0.40	c	c	≤0.04	≤0.25
	X42R vel L290R	≤0.24	≤1.20	≤0.025	≤0.015	≤0.40	≤0.06	≤0.05	≤0.04	≤0.25
	BN vel L245N	≤0.24	≤1.20	≤0.025	≤0.015	≤0.40	c	c	≤0.04	≤0.25
	X42N vel L290N	≤0.24	≤1.30	≤0.025	≤0.015	≤0.40	≤0.06	≤0.05	≤0.04	≤0.25
	X46N vel L320N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.40	≤0.07	≤0.05	≤0.04	≤0.25
	X52N vel L360N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	≤0.25
	X56N vel L390N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	≤0.25
	X60N vel L415N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	-
	X65N vel L450N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	-
	X70N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	-
	X80	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04