(2010年)最新公称压力(MPa)管道壁厚对照表(一)无缝碳钢管壁厚mm材料PNMPaDN1015202532405065801001251502002503003504004505006002012CrMo15CrMo12Cr1MoV≤1.62.533333.53.544444.5567788892.52.533323.53.544444.55677889104.02.533333.53.5444.555.578910111213156.43333.53.53.544.5567891112141617192210.033.53.544.54.55678910131518202216.044.55566789111315192426303420.044.556678911131518222832364.0T3.5444.5555.510Cr5Mo≤1.62.533333.53.544.5444.55.577888892.52.533333.53.544.5454.55.57789910124.02.533333.53.544.555.56891011121415186.43333.5444.555.5789111314161820222610.033.5444.555.57891012151822242616.044.555678910121518222832364020.044.55678911121518222634384.0T3.5444.5555.516Mn15MnV≤1.62.52.52.533333.53.53.53.544.555.5666672.52.52.52.533333.53.53.53.544.555.5677894.02.52.52.533333.53.544.55678891011126.42.53333.53.53.544.55678911121314161810.0333.53.5444.556789111315171916.03.53.544.55567891112161922252820.03.544.555.5678911131519242630(二)无缝不锈钢管壁厚mm材料PNMPaDN1015202532405065801001251502002503003504004505006001Cr18Ni9Ti含Mo不锈钢≤1.02222.52.52.52.52.52.5333.53.53.5444.51.622.52.52.52.52.5333333.53.544.5552.522.52.52.52.52.53333.53.544.556674.022.52.52.52.52.5333.544.556789106.42.52.52.53333.544.55678101113144.0T33.53.54444.5(三)焊接钢管壁厚mm材料PNMPaDN20025030035040045050060070080090010001100120014001600焊接碳钢管(Q235A20)0.2555555556666667770.6556666677778889101.055666778899101111121.66677889101112131415162.57899101112131516焊接不锈钢管0.2533333.53.53.54444.54.50.6333.53.53.5444.555661.03.53.544.54.555.567781.644.55667789102.556789910121315内压金属直管的壁厚根据SH3059-2001《石油化工管道设计器材选用通则》确定:当S0Do/6时,直管的计算壁厚为:S0=PD0/(2[σ]tΦ+2PY)直管的选用壁厚为:S=S0+C式中S0――直管的计算壁厚,mm;P――设计压力,MPa;D0――直管外径,mm;[σ]t――设计温度下直管材料的许用应力,MPa;Φ――焊缝系数,对无缝钢管,Φ=1;S――包括附加裕量在内的直管壁厚,mm;C――直管壁厚的附加裕量,mm;Y――温度修正系数,按下表选取。温度修整系数表钢管壁厚表示方法有管子表号、钢管壁厚尺寸和管子重量三种方法1)是以管子表号Sch表示壁厚。管子表号是管子设计压力与设计温度下材料许用应力的比值乘1000,并经圆整后的数值。即:Sch=P/[σ]t×1000ANSIB36.10壁厚等级:Sch10、Sch20、Sch30、Sch40、Sch60、Sch80、Sch100、Sch120、Sch140、Sch160十个等级;ANSIB36.19壁厚等级:Sch5s、Sch10s、Sch40s、S2)以钢管壁厚尺寸表示中国、ISO、日本部分钢管标准采用ch80s四个等级;表示英制管壁厚系列:Sch.20----全称:Schedule20Sch.10s--带s的系列为不锈钢专用,碳钢不用。举个例子:2sch.10s表示2”接管的壁厚为2.9mm,材质为不锈钢;2sch.40表示2”接管的壁厚为4.0mm。3)是以管子重量表示管壁厚度,它将管子壁厚分为三种:a.标准重量管,以STD表示b加厚管,以XS表示c.特厚管,以XXS表示。对于DN≤250mm的管子,Sch40相当于STD,DN200mm的管子,Sch80相当于XS。钢管壁厚的分级,在不同标准中所表示的方法也各不相同。ANSIB36.10和JIS标准中的管子表号为;Schl0、20、30、40、60、80、100、120、140、160。ANSIB36.19中的不锈钢管管子表号为:5S、10S、40S、80S。管表号(Sch.)并不是壁厚,是壁厚系列。实际的壁厚,同一管径,在不同的管子表号中其厚度各异。不同管子表号的管壁厚度,在美国和日本是应用计算承受内压薄壁管厚度的Barlow公式计算并考虑了腐蚀裕量和螺纹深度及壁厚负偏差-12.5%之后确定的,如公式(1-2-2)和(1-2-3)所示。tB=D0P/2[ó]t(1-2-2)t=[D0/2(1-0.125)×P/[ó]t]+2.54(1-2-3)式中tBt——分别表示理论和计算壁厚,mmD0————管外径,mmP——设计压力,MPa[ó]t——在设计温度下材料的许用压力,MPa计算壁厚径圆整后才是实际的壁厚。如果已知钢管的管子表号,可根据式(1-2-1)计算出该钢管所能适应的设计压力,即P=Sch..×[ó]t/1000(1-2-4)例如,库存Sch40,碳素钢20无缝钢管,当设计温度为350oC时给钢管所能适应设计压力为:P=40×92/1000①=3.68MPa中国石化总公司标准SHJ405规定了无缝钢管的壁厚系列并Sch.5S②,Sch.10,Sch.10s,Sch.20,Sch.20s,Sch.30,Sch.40,Sch。40s,Sch.60,Sch.80,Sch.100,Sch.120,Sch.140,Sch。160,如表1-2-9所示。2.以管子重量表示管壁厚度的壁厚系列美国MSS和ANSI规定的以管子重量表示壁厚方法,将管子壁厚分为;种:(1)标准重量管以STD表示;(2)加厚管以XS表示;(3)特厚管以XXS表示。DN250mm的管子,Sch40相当于STD管。DN200mm的管子,Sch80相当于XS管。常用钢材的化学成分和机械性能钢材类别序号钢号标准号化学成分%碳C锰Mn硅Si铬Cr镍Ni钼Mo钒V钛Ti钢板1A3YB175-632A3RYB536-690.220.40~0.650.12~0.30310MnRYB536-690.201.20~1.600.20~0.600.04~0.12415MnVRYB536-690.181.20~1.600.20~0.600.04~0.10509Mn2VRYB536-690.121.40~1.800.20~0.50620gGB713-720.16~0.240.35~0.650.15~0.305(C%-0.02)~0.80722gGB713-720.19~0.260.70~0.900.17~0.3780Cr18Ni9TiYB542-700.082.001.0017.0~19.08.0~10.591Cr18Ni9TiYB542-700.1212.001.0017.0~19.08.0~10.50.30~0.801000Cr19Ni10YB542-700.032.001.0018.0~20.08.0~12.018.0~25.0110Cr17Ni13Mo2TiYB542-700.082.000.8016.0~18.012.0~14.02.0~3.01200Cr17Ni14Mo2YB542-700.032.001.0016.0~18.012.0~16.0钢13A3YB231-70管1410YB231-700.07~0.140.35~0.650.17~0.370.150.251520YB231-700.17~0.240.35~0.650.17~0.350.250.251616MnYB231-700.12~0.201.20~1.600.20~0.60钢材类别序号钢号标准号化学成分%机械性能(不小于)其它硫S磷P抗拉强度σbkg/屈服点σskg/延伸率δs%冲击值αbkg-m/备注不大于钢板1A3YB175-6338~472426S4~202A3RYB536-690.0450.0403838242326267.06.56~16S17~26310MnRYB536-690.0450.0405250353321206.306~16S17~26415MnVRYB536-690.0450.0405452403818176.06~16S17~26509Mn2VRYB536-690.0400.0405035213.5(-70℃)S5~20620gGB713-720.0450.0404141252426256.06~16S17~25722gGB713-720.0450.0404327246.0S6~6080Cr18Ni9TiYB542-700.0200.035553891Cr18Ni9TiYB542-700.0200.03555381000Cr19Ni10YB542-700.0200.0355040110Cr17Ni13Mo2TiYB542-700.0200.03550451200Cr17Ni14Mo2YB542-700.0200.0355045钢管13A3YB231-700.0550.0453824221410YB231-700.0400.0353421241520YB231-700.0500.0404025201616MnYB231-700.0500.050523521钢材类别序号钢号标准号化学成分%碳C锰Mn硅Si铬Cr镍Ni钼Mo钒V钛Ti钢板1715MnVYB231-700.12~0.181.20~0.060.20~0.600.04~1.201812CrMoYB237-70≤0.150.40~0.700.20~0.400.40~0.700.40~0.551915CrMoYB237-700.12~0.180.40~0.700.20~0.400.80~1.100.40~0.5520Cr5MoYB237-70≤0.15≤0.60≤0.504.0~6.00.50~0.602112CrMoVYB529-700.08~0.150.80~0.120.50~0.80W0.30~0.550.40~0.650.25~0.352212Cr2MoWVBYB529-700.08~0.150.45~0.650.45~0.751.60~2.100.50~0.650.28~0.420.080.182312Cr3MoVSiTiBYB529-700.09~0.150.50~0.800.60~0.902.50~3.001.00~1.200.25~0.350.22~0.382412CrMoVYB529-700.08~0.150.40~0.700.17~0.3